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Invisibleohmatic
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24x24 h14 hepa flowhood - NEW DESIGN
    #5569636 - 04/29/06 05:41 AM (17 years, 9 months ago)

enjoy the pics, from left to right :sun:






total cost ~ 3oo euros - time to build ~6 hrs.

the measurements and scematics, in centimeters:



1.) 64,2 x 62,2 cm
2.) 30,6 x 61,0 cm
3.) 30,0 x 61,0 cm
4.) 20,7 x 61,0 cm
5.) 78,4 x 61,0 cm
6.) 61,0 x 61,0 x 6,9 cm hepa filter
7.) 30,6 x 60,0 x 5,0 cm prefilter (had to add some little stick of wood to its side compensate the missing 1cm)

and the two sidepanels, each measuring: 64,2 x 78,4 cm.

the wood used was 16mm thick and the blower delivering 400 cfm.

silicone has been used during the entire construction in order to allow simple deconstruction (the white/grey mass).

:mushroom2:




I REDESIGNED THE MOFO !!! :sun:


 

its a lot tighter now :smirk:


Edited by ohmatic (09/30/06 04:31 AM)


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Invisibleshobimono
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Re: my 24x24 h14 hepa flowhood [Re: ohmatic]
    #5569684 - 04/29/06 06:54 AM (17 years, 9 months ago)

Very nice, thanks for sharing it with us!

Is the prefilter permanently mounted in place? If yes, how would you change it?

What efficiency is your hepa? and how thick is it?


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Invisibleohmatic
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Re: my 24x24 h14 hepa flowhood [Re: shobimono]
    #5569697 - 04/29/06 07:13 AM (17 years, 9 months ago)

Quote:

shobimono said:
Is the prefilter permanently mounted in place? If yes, how would you change it?




it is, as everything else, "siliconed" into place and i would have to remove a sidepanel
in order to change it - but that wont happen anytime soon :smirk:

Quote:

What efficiency is your hepa? and how thick is it?




Quote:

thread title: h14 = 99.999% / 99.997%

6.) 61,0 x 61,0 x 6,9 cm hepa filter




--------------------
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InvisibleDiploidM
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Re: my 24x24 h14 hepa flowhood [Re: ohmatic]
    #5569733 - 04/29/06 07:42 AM (17 years, 8 months ago)

How loud is it?

I used to have one of those small, long squirrel cage blowers in my flowhood and it made a racket. I eventually replaced it with an oversized one running more slowly to get the noise down.


--------------------
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2) You can't have an abortion no matter how much you don't want a child.
3) You can't have a certain plant in your possession or you'll get locked up with a rapist and a murderer.

4) We need a smaller, less-intrusive government.


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Invisibleohmatic
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Re: my 24x24 h14 hepa flowhood [Re: Diploid]
    #5569740 - 04/29/06 07:47 AM (17 years, 8 months ago)

oh it isnt so bad, its not silent either, i havent got any numbers but its ok.

i simply put on my headphones while working and i cant hear anyhting :smile:


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OfflineRogerRabbitM
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Re: my 24x24 h14 hepa flowhood [Re: ohmatic]
    #5571013 - 04/29/06 04:56 PM (17 years, 8 months ago)

Nice flowhood there ohm. You're right about the prefilter lasting a long time. I'm still using one I taped in place 4 years ago. It 'looks' dirty, but the truth is, a dirty air filter is a better filter than a brand new one. I'll replace it when the flow starts to reduce. I need to get me a bigger hood, still struggling with a 12 X 24.
RR


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"I've never had a failed experiment.  I've only discovered 10,000 methods which do not work."
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Invisibleohmatic
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Re: my 24x24 h14 hepa flowhood [Re: RogerRabbit]
    #5573157 - 04/30/06 03:11 AM (17 years, 8 months ago)

i went 24x24 mainly because of spawnbags, it is so much more convenient knowing
that they can stand upright in the laminar flow during inoculation :smile:


--------------------
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Offlinewaixingren
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Re: my 24x24 h14 hepa flowhood [Re: ohmatic]
    #5576545 - 05/01/06 08:11 AM (17 years, 8 months ago)

you smell like poop! :hehehe:


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Offlinemattymonkey
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Re: my 24x24 h14 hepa flowhood [Re: ohmatic]
    #5576553 - 05/01/06 08:17 AM (17 years, 8 months ago)

:thumbup: nice one ohm, enjoy :smile:


--------------------
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Invisibleseti
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Re: my 24x24 h14 hepa flowhood [Re: ohmatic]
    #5590012 - 05/04/06 01:08 PM (17 years, 8 months ago)

Isn't the rectangular hole you cut out too small to let all the air flow through the filter? So the sides on the hepa filter where there is no hole are essentially useless? Please fill me in.


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Invisibleohmatic
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Re: my 24x24 h14 hepa flowhood [Re: seti]
    #5593032 - 05/05/06 06:30 AM (17 years, 8 months ago)

Quote:

seti said:
Isn't the rectangular hole you cut out too small to let all the air flow through the filter? So the sides on the hepa filter where there is no hole are essentially useless? Please fill me in.






the hole i cut serves the purpose of getting air pushed through by the fan and building up pressure in the plenum behind the filter.

the sidepanels make the "box" which is pressurized and forces the air to pass through the hepa filter
therefor providing laminar flow, without the panels this wouldnt be as it would just go out of the sides.

the hole just needs to be about the size of the outlet of the fan,
i decided to cut it approx 0.5cm smaller than that in order to ensure
a little overlap to get nice pressure in there - seals better.


--------------------
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OfflineRogerRabbitM
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Re: my 24x24 h14 hepa flowhood [Re: ohmatic]
    #5593266 - 05/05/06 08:58 AM (17 years, 8 months ago)

Ohm, Are you sure that's a laminar flow filter? I've never seen one that thin. Most are three to four times that thickness and the element is made of ceramic. Don't trust the designation 'hepa' because I've seen it used even on furnace and vacuum cleaner filters before, which would not give proper filtering when under static pressure. Also, with four square feet of filter, and a 400 cfm blower, your clean air speed would be at the minimum of 100 linear feet per second leaving the fan, provided there was no loss, which is impossible. I think you're going to want to pick up a 600 cfm blower. I hope it all works out for you.
RR


--------------------
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semper in excretia sumus solim profundum variat

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OfflineAnnoA
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Re: my 24x24 h14 hepa flowhood [Re: RogerRabbit]
    #5593386 - 05/05/06 09:54 AM (17 years, 8 months ago)

The blower delivers 400 cfm at 1" of static pressure.

Yes, it is a HEPA, class H14, 99.997% efficiency up to 0.12 micrometers particle size.

Here is the datasheet
http://www.unifil.ch/Deutsch/2_sotiment/...7%20d%20neu.pdf


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Invisibleohmatic
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Re: my 24x24 h14 hepa flowhood [Re: RogerRabbit]
    #5593897 - 05/05/06 12:18 PM (17 years, 8 months ago)

Quote:

RogerRabbit said:
I've never seen one that thin. 




look at pics of flowhood anno built, those filters arent thicker either:



i am also very happy with how it performs, poured plates, did transfers,
inoculated grains - all stays lovely sterile :smile:


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Offlinehydr0420
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Re: my 24x24 h14 hepa flowhood [Re: waixingren]
    #5594276 - 05/05/06 01:44 PM (17 years, 8 months ago)

Quote:

waixingren said:
you smell like poop! :hehehe:




Agreed


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Offlineshirley knott
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Re: my 24x24 h14 hepa flowhood [Re: hydr0420]
    #5594821 - 05/05/06 04:35 PM (17 years, 8 months ago)

he does smell poopy  :laugh:


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buh


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Invisibleohmatic
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Re: my 24x24 h14 hepa flowhood [Re: shirley knott]
    #5594837 - 05/05/06 04:44 PM (17 years, 8 months ago)

love you guys too  :bigblunt:


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:penis: MONOTUB tek :sun: HEATBOMB tek :penis:

RIP #cultivation! ....can't associate? well FUCK U !


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Re: my 24x24 h14 hepa flowhood [Re: ohmatic]
    #5604181 - 05/08/06 08:02 AM (17 years, 8 months ago)

Quote:

ohmatic said:
i went 24x24 mainly because of spawnbags, it is so much more convenient knowing
that they can stand upright in the laminar flow during inoculation :smile:




did somebody call my name?


--------------------
X II IV


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Invisibleohmatic
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Re: my 24x24 h14 hepa flowhood [Re: X24]
    #5710188 - 06/04/06 02:41 AM (17 years, 7 months ago)

god i love this hood :sun:




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RIP #cultivation! ....can't associate? well FUCK U !


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Re: my 24x24 h14 hepa flowhood [Re: ohmatic]
    #5711360 - 06/04/06 01:59 PM (17 years, 7 months ago)

/me gasps at the sight of fingernails near a petri dish. Wear latex gloves bro!
RR


--------------------
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semper in excretia sumus solim profundum variat

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Invisibleohmatic
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Re: my 24x24 h14 hepa flowhood [Re: RogerRabbit]
    #5711418 - 06/04/06 02:18 PM (17 years, 7 months ago)

lol yeah  :bigblunt: :bigblunt: :bigblunt:


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RIP #cultivation! ....can't associate? well FUCK U !


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Re: my 24x24 h14 hepa flowhood [Re: ohmatic]
    #5712751 - 06/04/06 09:02 PM (17 years, 7 months ago)

Will a 747 CFM Vortex In-line fan work for one like a above?


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Invisibleohmatic
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Re: my 24x24 h14 hepa flowhood [Re: Brainiac]
    #5714098 - 06/05/06 07:13 AM (17 years, 7 months ago)

Quote:

Brainiac said:
Will a 747 CFM Vortex In-line fan work for one like a above?




look fungifun.org/flowhood

Quote:

1. Find out the area of your filter by multiplying the width and the hight in feet (for instance the smallest reasonably usable filter would be 2ft x 1ft)

2ft x 1ft = 2 ft2

2. Multiply the required air speed(the one Stamets specifies, 100 ft/min) with the area of your filter

100 ft/min x 2 ft2 = 200 ft3/min

So 200 ft3/min(= cfm = "cubic feet per minute") is the amount of air your blower must deliver at the sum of the STATIC PRESSURE of the HEPA filter + prefilter.

NOTE: 1 cfm= 1.7m3/h

So if you use the above filter with 1"(250Pa) static pressure and a furnace prefilter with a static pressure of 0.2"(50Pa) your blower must deliver 200 cfm(340m3/h) of air at a static pressure of 1.2"(300Pa).

Finding the correct blower
Every blower should have a data sheet with a characterisitc curve that shows the air output in dependance of the static pressure. Every blower has a data sheet (consult the manufacturer if this is not the case with your blower) where the correlation between the flow and the static pressure is represented by a graph or table.

Here is such a set of curves for 4 blowers(numbered 1-4).
NOTE: Each model of a blower has his own characteristical curve. This chart shows the curvers for 4 different particular models of axial duct blowers.
What you can clearly see is that the bigger the static pressure the less air the blower delivers, up to the maximum static pressure where the air output is zero.





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RIP #cultivation! ....can't associate? well FUCK U !


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Re: my 24x24 h14 hepa flowhood [Re: ohmatic]
    #5716099 - 06/05/06 06:24 PM (17 years, 7 months ago)

Since the hepa's 2'(2')4'(100) 400 c.f. I'm guessing that 747 cfm would be overkill.But,I'm going over just so I will have enough for the hepa.
Thanks


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Re: my 24x24 h14 hepa flowhood [Re: Brainiac]
    #5719368 - 06/06/06 03:18 PM (17 years, 7 months ago)

Thank you very much for the detailed write-up. Beautiful. :cool:


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Re: my 24x24 h14 hepa flowhood [Re: MycoCakeEater]
    #6117806 - 09/30/06 04:24 AM (17 years, 4 months ago)

i re-designed my hood, new pics added :sun:


--------------------
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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: ohmatic]
    #6619285 - 02/28/07 01:51 AM (16 years, 10 months ago)

*bump* for flowhood discussion thread.


--------------------
:penis: MONOTUB tek :sun: HEATBOMB tek :penis:

RIP #cultivation! ....can't associate? well FUCK U !


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InvisibleLiquidkick
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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: ohmatic]
    #6629768 - 03/02/07 10:00 PM (16 years, 10 months ago)

Explain to me how these flowhoods work...

So your ledge right there infront of the white hepa filter is your work area? And air is blowing out of the filter or sucking in?

Wouldn't air blowing across the work area be bad?


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: Liquidkick]
    #6630887 - 03/03/07 08:20 AM (16 years, 10 months ago)

It is a positive pressure flowhood so the air travels out of the filter and over the work area. The air comming out of the filter should be 99.99% contam free down to 3um.


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Invisibleohmatic
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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: Liquidkick]
    #6631268 - 03/03/07 11:55 AM (16 years, 10 months ago)

Quote:

Liquidkick said:
So your ledge right there infront of the white hepa filter is your work area?




yes, right in front of the filter.

Quote:

And air is blowing out of the filter or sucking in?




as is getting sucked through the green prefilter, then pressurized in the chamber
behind the hepafilter and pressed through the hepa creating a laminar airflow.

Quote:

Wouldn't air blowing across the work area be bad?



DIRTY air would be bad, yes.
however that is the whole point of the flowhood, the prefilter and especially the
hepa filter are for reducing the airborn contam particles down to a size of
less than 3 mictron which covers all sorts of mold spores and alike.

the air that leaves the hepa filter and flows over the work surface is sterile.


--------------------
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RIP #cultivation! ....can't associate? well FUCK U !


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InvisibleLiquidkick
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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: ohmatic]
    #6634040 - 03/04/07 11:05 AM (16 years, 10 months ago)

So if the air is sterile blowing out of the air filter into the work area.

Wouldn't the surrounding air in the room have a chance to mix with the sterile air and blow contams into your stuff?

I always thought a flow hood, from what i understand from biology and chem lab was that it sucks the air up? and you have a glass sliding door that slides up and down...


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: Liquidkick]
    #6634612 - 03/04/07 03:12 PM (16 years, 10 months ago)

> I always thought a flow hood, from what i understand from biology and chem lab was that it sucks the air up?

That is a fume hood. A flow hood or laminar flow hood blows sterile, hepa filtered air through or across your work area so that you don't get airborne contams in your work. It's the exact opposite of a fume hood.


-FF


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: fastfred]
    #6634637 - 03/04/07 03:25 PM (16 years, 10 months ago)

Wouldn't air blowing across the work area be bad?
The air coming out of my 18x24 is around 1,092 CFM -/+.Drity air
isn't goinng to blow across the work area.


--------------------
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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: Liquidkick]
    #6634639 - 03/04/07 03:25 PM (16 years, 10 months ago)

Quote:

Liquidkick said:
Wouldn't the surrounding air in the room have a chance to mix with the sterile air and blow contams into your stuff?




not really, as the flow is laminar, that means totally uniform throughout the whole
filter surface.

as there is a constant airflow, you can imagine this like a cube of sterile air
that is being pushed towards me - and i am working in this sterile cube.

air circulation, if at all, happens on the outside of the filters surface are,
outside the "sterility cube" and because i dont work there, this does not matter.


--------------------
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RIP #cultivation! ....can't associate? well FUCK U !


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: ohmatic]
    #6634943 - 03/04/07 05:11 PM (16 years, 10 months ago)

You should also run the hood for at least half an hour before beginning sterile work in a small, closed room. The flowhood will practically clean up the entire room in that time.
RR


--------------------
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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: RogerRabbit]
    #6635900 - 03/04/07 09:51 PM (16 years, 10 months ago)

I first spray Oust all over up high & run mine 30 minutes.
To purge it, before use.:thumbup:


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: agar]
    #6698298 - 03/22/07 04:57 AM (16 years, 10 months ago)

Quote:

agar said:
I first spray Oust all over up high & run mine 30 minutes.
To purge it, before use.:thumbup:




I saw this a few months ago and you made me think of it. The second document is the one I mean.

Clogging of HEPA Fibrous Filters by Solid and Liquid Aeresol Products: An Experimental Study
For several years, environmental purification requirements have become more and more stringent. Among all the devices designed to remove small particles from gas streams, fibrous filters are economically the most interesting technology since they are both effective and quite simple to use. They are made up of an entanglement of thin fibres in which particles are collected according to several mechanisms like diffusion, interception or inertia. If clean filters are relatively well-known and have been the subject of many studies, their behaviour during clogging is still not completely understood. This aspect is of major importance as it determines the life time of the filter. We describe in this paper the filtration experiments carried out with solid particles on one hand and liquid particles on the other hand. The evolution of pressure drop in relation to the d eposit aspect is analysed in both cases and a comparison of both behaviours is performed.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: llamabox]
    #6698323 - 03/22/07 05:37 AM (16 years, 10 months ago)


I also run a Simco for 30 minutes before purging the flowhood.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: agar]
    #6699253 - 03/22/07 12:57 PM (16 years, 10 months ago)

i started puring it for 10 mins before use, i really like to do it that way since.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: ohmatic]
    #6699305 - 03/22/07 01:18 PM (16 years, 10 months ago)

Yo ohm. Fabulous hood! Are you using a pre-filter?


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: Arp]
    #6699382 - 03/22/07 01:52 PM (16 years, 10 months ago)

Quote:

Arp said:
Yo ohm. Fabulous hood! Are you using a pre-filter?




uuuuuuh ..




.. yes :tongue:


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: ohmatic]
    #6699414 - 03/22/07 02:05 PM (16 years, 10 months ago)

ah goddamn i missed it. cool bro :thumbup:


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: Arp]
    #6699443 - 03/22/07 02:18 PM (16 years, 10 months ago)

Quote:

Arp said:
ah goddamn i missed it. cool bro :thumbup:






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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: ohmatic]
    #6700070 - 03/22/07 05:31 PM (16 years, 10 months ago)

What works amazingly well as a pre-filter.
Are stacked auto engine filters.
They are far more efficient, than furnace filters.
Most are rated in the 3.5 to 4 micron range.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: agar]
    #6700313 - 03/22/07 06:49 PM (16 years, 10 months ago)

Im not sure but wouldnt engine filters cause too much resistance?


--------------------



[quote]KristiMidocean said:
Good now thats clear.WHO FUCKING CARES. If I am fat u all keep pointing it out like its suppose to be a secret.LIke u really have nothing better to do then make fat jokes. If o know its like I do I know yall can come up with NEW AND BETTER SHIT . This shit is old and boring . I left in the first place cause this shit got boring not because of the fat jokes . Fat jokes dont bother me but seriously its old[/quote]


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: Psychoslut]
    #6701800 - 03/23/07 01:39 AM (16 years, 10 months ago)

Quote:

Psychoslut said:
Im not sure but wouldnt engine filters cause too much resistance?




you can lookup the resistance for every filter on its datasheet and as you do that anyway BEFORE
you buy a blower its easy as that to buy one fitting your needs.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: ohmatic]
    #6739313 - 04/02/07 05:42 PM (16 years, 9 months ago)

just a little note on finding hepa filters... Check your local yellowpages! I got mine from a guy who does clean-rooms. They almost always have surplus filters from big jobs that they'll get rid of for cheap. Mine is a 2'x4' 99.97% .3 micron Flanders gel seal, aluminum frame- got it for $80 CAD cash!


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: ohmatic]
    #6750856 - 04/05/07 02:22 PM (16 years, 9 months ago)



disco-hood :naughty:


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: Arp]
    #6763411 - 04/08/07 11:37 PM (16 years, 9 months ago)

Hey Arp is that a whole house fan? It's huge. How do you like the vertical hood? I haven't seen too many of those used.

Heruuka- What was this guy listed under in the yellow pages?


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: CarharttKidd]
    #6763713 - 04/09/07 01:39 AM (16 years, 9 months ago)



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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: CarharttKidd]
    #6764137 - 04/09/07 05:47 AM (16 years, 9 months ago)

Been working well. I think it was my best option to get more clean space cause of the filter size.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: Arp]
    #6766020 - 04/09/07 03:14 PM (16 years, 9 months ago)

You inspired me to build mine.

24x24 HEPA 99.99



Birch ply.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: MycoCakeEater]
    #6766828 - 04/09/07 06:23 PM (16 years, 9 months ago)

Hey agar thats sweet. Your Pressure cooker cools in laminar flow. Nice. Thats a cool little impulse sealer too.


Edited by CarharttKidd (04/09/07 06:32 PM)


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: CarharttKidd]
    #6777744 - 04/12/07 01:19 AM (16 years, 9 months ago)

Quote:

CarharttKidd said:
Hey agar thats sweet. Your Pressure cooker cools in laminar flow. Nice.




im sure it doesnt, iirc agar is absolutely against wasteing any of the filters lifetime
on "cooling jobs".


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: ohmatic]
    #6777938 - 04/12/07 03:15 AM (16 years, 9 months ago)

Quote:

ohmatic said:
Quote:

CarharttKidd said:
Hey agar thats sweet. Your Pressure cooker cools in laminar flow. Nice.




im sure it doesnt, iirc agar is absolutely against wasteing any of the filters lifetime
on "cooling jobs".




TRUE THAT.
I conserve that filter, for it's intended use.
PC cools on a steel rack.
Packing a loaded 941 around HOT, isn't fun.
Weights about 75 lbs full.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: MycoCakeEater]
    #6780882 - 04/12/07 09:39 PM (16 years, 9 months ago)

lazy fool wheres the pre-filter?


--------------------



[quote]KristiMidocean said:
Good now thats clear.WHO FUCKING CARES. If I am fat u all keep pointing it out like its suppose to be a secret.LIke u really have nothing better to do then make fat jokes. If o know its like I do I know yall can come up with NEW AND BETTER SHIT . This shit is old and boring . I left in the first place cause this shit got boring not because of the fat jokes . Fat jokes dont bother me but seriously its old[/quote]


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: Psychoslut]
    #6781188 - 04/12/07 10:44 PM (16 years, 9 months ago)

Its taped over the fan intake, like a large sheet of polyfil


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: MycoCakeEater]
    #6803696 - 04/18/07 09:55 AM (16 years, 9 months ago)

OHHH ok Ive seen those sheets of polyfill covering fans before. I forget where.


--------------------



[quote]KristiMidocean said:
Good now thats clear.WHO FUCKING CARES. If I am fat u all keep pointing it out like its suppose to be a secret.LIke u really have nothing better to do then make fat jokes. If o know its like I do I know yall can come up with NEW AND BETTER SHIT . This shit is old and boring . I left in the first place cause this shit got boring not because of the fat jokes . Fat jokes dont bother me but seriously its old[/quote]


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Re: my 24x24 h14 hepa flowhood [Re: ohmatic]
    #12629172 - 05/25/10 10:23 PM (13 years, 8 months ago)

Quote:

ohmatic said:
i went 24x24 mainly because of spawnbags, it is so much more convenient knowing
that they can stand upright in the laminar flow during inoculation :smile:




Hey,

I bought a Fungi Perfecti 12 X 24 to build a flow hood with...
...If I build the stand-alone box type, then I might be able to
use it standing on its side.

How useful for spawn bags might a 24 X 12 hood be?

Thanks!

JD


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Re: my 24x24 h14 hepa flowhood [Re: Javadog]
    #12629208 - 05/25/10 10:29 PM (13 years, 8 months ago)

Dude this thread is over 3 years old, let her RIP.


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Re: my 24x24 h14 hepa flowhood [Re: ohmatic]
    #12629293 - 05/25/10 10:44 PM (13 years, 8 months ago)

Quote:

ohmatic said:
Quote:

seti said:
Isn't the rectangular hole you cut out too small to let all the air flow through the filter? So the sides on the hepa filter where there is no hole are essentially useless? Please fill me in.




<SNIP>

the hole just needs to be about the size of the outlet of the fan,
i decided to cut it approx 0.5cm smaller than that in order to ensure
a little overlap to get nice pressure in there - seals better.




Hey Ohm,

I am quite the noob, but in my research on flow hoods and squirrel
fans I am sure that I read that squirrel fans should not be slowed by
blocking the output, but that the intake should be blocked, in part,
to reduce flow.

I think that I understand the concept here.  I have a caged-fan type
of rowing machine, and the way you reduce the drag when working out
is to close the vents to the fan.  This way the fan cannot interact
with the outside air reducing drag.

The article that I am recalling suggested that blocking the output
of such a fan puts extra load on the fan.

Now, I write all of this thinking that the percentage that you covered
is very small and not an issue.

...but I just wanted to add to the discussion.

JD

P.S. I did a search and saw this, part of an iten description on Amazon:

"This squirrel cage shaded pole blower fan does not come with a power cord. It is a great all-around blower. You can reduce the CFM of the blower by partially blocking the intake, but DO NOT block the blower's output. That will burn the blower out."


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Re: my 24x24 h14 hepa flowhood [Re: Javadog]
    #12629755 - 05/26/10 12:18 AM (13 years, 8 months ago)

NOTHING is blocking the output, the overlap is simply for better sealing.

its far to small to block anything.


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Re: my 24x24 h14 hepa flowhood *DELETED* [Re: ohmatic]
    #12670491 - 06/02/10 02:07 AM (13 years, 7 months ago)

Post deleted by mainratte

Reason for deletion: .



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Re: my 24x24 h14 hepa flowhood [Re: mainratte]
    #12670789 - 06/02/10 04:56 AM (13 years, 7 months ago)

i thin kyour referring to to agar, well the flow from above gets you one problem,
you have got SIDES to the filter where the air has to pass,
these areas can catch contams which would in return get swirld around.

if you work infront of the filter, like in my design, you dont have any sides
to it and nothing to be blown around.

ill always be working in front of it.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN *DELETED* [Re: ohmatic]
    #12673318 - 06/02/10 04:24 PM (13 years, 7 months ago)

Post deleted by mainratte

Reason for deletion: .



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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: mainratte]
    #12676762 - 06/03/10 03:28 AM (13 years, 7 months ago)

Quote:

mainratte said:
what about yourself? isnt ones body not also a factor of getting some swirls back in or do the 100 ft/min compensate for that?




you cabn think of a "cube" of sterile air that is created infront of the filter.

obviously any contam introduced there, may be your arms or dirty equipment,
is going to be present.

this is why i wash my hands/arms thoroughly and rub them with rubbing alcohol once dry.

it is advisable to also wear gloves, sanitised of course.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN *DELETED* [Re: ohmatic]
    #12677340 - 06/03/10 08:24 AM (13 years, 7 months ago)

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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: mainratte]
    #12682736 - 06/04/10 02:03 AM (13 years, 7 months ago)

From what I've read; I see no point in the pre-filter for a industrial Hepa Filter. The reports stated that Hepa filters perform better after years of use. Regardless, a Industrial Hepa filter lasts 10 years or more.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: iluvfungi]
    #12701942 - 06/07/10 08:08 AM (13 years, 7 months ago)

Double-tap for the win. Hi Ohm.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: iluvfungi]
    #12704136 - 06/07/10 04:12 PM (13 years, 7 months ago)

Quote:

iluvfungi said:
From what I've read; I see no point in the pre-filter for a industrial Hepa Filter. The reports stated that Hepa filters perform better after years of use. Regardless, a Industrial Hepa filter lasts 10 years or more.




This is good news....given that I intend to use mine only for
clean work and not as a house filter.

BTW: my 18X24 came from Fungi Perfecti today. Whee!

(thanks to the forgotten poster who suggested the 18", and
that it will help with spawn bags better)

Now, I have to find the best directions.  (I think that other sites
step by step process "first to attach the bottom, then the sides, etc"
is the best approach that I have seen)  I have no illusions
that I will find blue-prints with precise dimensions to cut for this
filter...


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: iluvfungi]
    #12705859 - 06/07/10 09:29 PM (13 years, 7 months ago)

Quote:

iluvfungi said:
From what I've read; I see no point in the pre-filter for a industrial Hepa Filter. The reports stated that Hepa filters perform better after years of use. Regardless, a Industrial Hepa filter lasts 10 years or more.




LOL  If you've ever looked at any sort of filter after a year or so of use you'll know that they are clogged with cat hair, dust bunnies, and all sorts of nasty shit.

When you get enough organic material on your filter it will form a breeding place for contams and a storehouse for all sorts of shit you don't want.  With a cheap prefilter you just replace it.  When it's on your hepa you can't really afford to throw it out all the time.

No filter is perfect, and when you let a shit ton of bullshit built up on the actual filter that shit will continuously release spores and other bullshit, some of which will make it through.

So go ahead and not use a prefilter.  When your flow rate drops and you start getting too many contams making it through you'll know the reason.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: fastfred]
    #12706754 - 06/08/10 12:12 AM (13 years, 7 months ago)

Quote:

fastfred said:
So go ahead and not use a prefilter.  When your flow rate drops and you start getting too many contams making it through you'll know the reason.
-FF




100% agreed :smile:

thx for your agar collection btw +5


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: ohmatic]
    #13048624 - 08/13/10 10:05 PM (13 years, 5 months ago)

is there a better way to seal the filters without siliconing them in?? would be a hassle when you have to change them.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: trypnotic]
    #13048647 - 08/13/10 10:09 PM (13 years, 5 months ago)

Weatherstripping.
RR


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: RogerRabbit]
    #13048886 - 08/13/10 11:10 PM (13 years, 5 months ago)

thx RR, one more question, what do you think would be the best material to use, wood harbors contams right? any suggestions?


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: trypnotic]
    #13133475 - 09/01/10 12:28 PM (13 years, 4 months ago)

trypnotic    Unless your relative humidity is very high in the room you work in you shouldn't have to worry much about wood getting to bent out of shape.  (ha ha i had to do that)  :smile: 

If you start with good clean wood there should not be any problems.  If you are worried you could always apply a bright white cleanable paint over the wood before construction.

  Great thread by the way.  I'm waiting to build a new flowhood as my last 2X2 ft one got confiscated by LEO.  Love 'em.  :wink:

I like the folding door/cover design.  Very space efficient. :laugh:


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: trypnotic]
    #13133767 - 09/01/10 01:33 PM (13 years, 4 months ago)

trypnotic -

If you dont mind the additional weight, Melamine plywood is a nice option.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: OrangeBarrel]
    #13199663 - 09/15/10 02:30 PM (13 years, 4 months ago)

http://www.rabbitair.com/BioGS-SPA-421A-Ultra-Quiet-HEPA-Air-Purifier.aspx

hey guys could check this link out and tell me if this type of air purifier would be effective enough for our needs.  I've been lazy trying to build my own and this is practically the same amount i would spend anyway. I would really appreciate some feedback, thanks.

tryp


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: trypnotic]
    #13199980 - 09/15/10 03:30 PM (13 years, 4 months ago)

It will help to control dust indoors, but don't expect to use it in place of a flow hood.  I have a similar, but lower-end one I run all winter when the wood stove is going because it helps keep ash, pet dander, and dead skin cells down to a minimum during the winter when we don't have the windows wide open for air.  I always shut it off and close the doors to the small room I use for sterile work when I'm running the flow hood though.
RR


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: RogerRabbit]
    #13200268 - 09/15/10 04:28 PM (13 years, 4 months ago)

roger, doesnt that "air purifier" get insanely dirty all time time ?
after all our is is laden with stuff.


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: ohmatic]
    #13200415 - 09/15/10 05:07 PM (13 years, 4 months ago)

Thanks RR.

Well since that won't work I have another dilemma, I was looking around for an h14 hepa filter and all the sites i went on require my info including what company I'm from. Since I'm just working from home for my personal adventures, any advice on how to get around putting my info out when purchasing one?


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Invisibleohmatic
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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: trypnotic]
    #13202566 - 09/16/10 02:34 AM (13 years, 4 months ago)

Quote:

trypnotic said:
Thanks RR.

Well since that won't work I have another dilemma, I was looking around for an h14 hepa filter and all the sites i went on require my info including what company I'm from. Since I'm just working from home for my personal adventures, any advice on how to get around putting my info out when purchasing one?




there is nothing illegal about a hepa filter


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: ohmatic]
    #13250414 - 09/26/10 06:06 PM (13 years, 4 months ago)

Dear Ohmatic

I've read, re-read, and re-read your monotub TEK.

I was wondering if you may be so kind and gracious as to elaborate on a few things via IRC chat, private email or even in a forum post.

I've got grain bags in spawn run and I want to follow your TEK to the letter but some of the steps are a bit vague.

I would really appreciate your time.

-pb


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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: pbint]
    #13252335 - 09/27/10 04:19 AM (13 years, 4 months ago)

Quote:

pbint said:
I've got grain bags in spawn run and I want to follow your TEK to the letter but some of the steps are a bit vague.





wrong thread but they aren't vague they literally are that simple
and i think leaving out stuff like "--now open your bag--" doesnt really confuse ppl.


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Offlinepbint
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Re: 24x24 h14 hepa flowhood - NEW DESIGN [Re: ohmatic]
    #13256421 - 09/27/10 09:40 PM (13 years, 4 months ago)

Hi

First I'll comment on the topic at hand. Your flow hood design is bad ass! You used to not use proper sterile technique (I know because I've read your original spawnbag tek)

What motivated you to build this flow hood? Has it helped you get better results?

I've had very bad luck trying to get spawn bags to colonize. They mostly get contaminated with bacillus (sweet fruity smelling bacteria). Even the ones I've bought from sporeworks. I'm considering building a Laminar Flow-Hood like this one. I just finished building a glove box I'll see if that helps me out, but I've had some bad luck even with injecting store-bought, sealed, "guaranteed," grain bags.

I apologize for using the wrong thread, I wanted to post to a newer thread so you would see it.

I have specific questions regarding your monotub tek:

1.) How much grain spawn did you use?
2.) Did you mix your grain spawn, broken up, in with the Beer treated vermiculite? or did you layer it evenly over the verm?
3.) Did you strain off the beer and let the verm dry out a bit or sterilize it, and throw it in the tub?
4.) What do you mean by this: "patched by kicking around substrate," ??

I think your idea of using verm for both the substrate and casing is brilliant. Removes the risk of pasteurized substrates, is easy to obtain, and absorbs anything.

Thanks in Advance
Pbint


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InvisiblePeterthinks
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Re: my 24x24 h14 hepa flowhood [Re: RogerRabbit]
    #13256508 - 09/27/10 10:01 PM (13 years, 4 months ago)

Quote:

RogerRabbit said:
Nice flowhood there ohm.  You're right about the prefilter lasting a long time.  I'm still using one I taped in place 4 years ago.  It 'looks' dirty, but the truth is, a dirty air filter is a better filter than a brand new one.  I'll replace it when the flow starts to reduce.  I need to get me a bigger hood, still struggling with a 12 X 24.
RR



If you weren't so far away I'd say I have one you can buy, 6 feet by 2.5 feet with a big bench in front.


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Invisible13shroomsM
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Re: my 24x24 h14 hepa flowhood [Re: Peterthinks]
    #13929942 - 02/08/11 08:40 PM (12 years, 11 months ago)

:bump:  for pure bad ass-ness. :minigun:

:scaryshroom::thumbup:



Im currently tryin to design my flowhood and Im using a 2'x2'x11.5" filter for my hood.

all I would have to do is adjust the plenum for my filter compared to his design and I could do a similar setup for myself :yesnod:

:thanx:  :levitate:


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Edited by 13shrooms (02/08/11 08:45 PM)


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Re: my 24x24 h14 hepa flowhood [Re: RogerRabbit]
    #13933269 - 02/09/11 12:05 PM (12 years, 11 months ago)

Quote:

RogerRabbit said:
Nice flowhood there ohm.  You're right about the prefilter lasting a long time.  I'm still using one I taped in place 4 years ago.  It 'looks' dirty, but the truth is, a dirty air filter is a better filter than a brand new one.  I'll replace it when the flow starts to reduce.  I need to get me a bigger hood, still struggling with a 12 X 24.
RR





Me too RR I noticed that in your video and then felt better as misery loves company. I would like to go to at least 3 x2 and dream of 2 x6 I got the blowers I need, just the time and the $ for the filters

Dare to dream, maybe a good project for next winter :rockon:


--------------------
Mycoelf

Sterility is a process that can be likened unto infinity, which is a long walk, the closer to the end you start before beginning, the more achievable  the goal of infinity becomes.  Remember, cleanliness in next to goddessness

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OfflineFruiting
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Re: my 24x24 h14 hepa flowhood [Re: mycoelf]
    #21736333 - 05/29/15 10:54 AM (8 years, 7 months ago)

Somebody willing to help me a little bit?
I think I´ll be doing my own flowhood.

I´ve got some choices here, http://www.atex-filter.de/system/pdfs/371/original/Hepatex_CR_EN.pdf?1425373726

There´s H14 and some other options. Is it good to have more than H14?
(->scroll down->)
Are all these standard sizes converted into the metrical system? Which one would you recommend for a beginner? 12x24 or so? Do I need to worry about it having a standard size?

Basically I need to hear some experienced scientist telling me OK, go for it, these will work, or so. The work with the wood is as easy as ordering and gluing, and with the blower I will have to do some math.

Thanks




Edited by Fruiting (05/29/15 12:15 PM)


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Invisibleohmatic
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Re: my 24x24 h14 hepa flowhood [Re: Fruiting]
    #21740733 - 05/30/15 11:41 AM (8 years, 7 months ago)

h14 and 12x24 is perfectly fine


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