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Offlinepaddo
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want to construct a HEPA flowhood *UPDATE*
    #798916 - 08/06/02 12:07 AM (19 years, 1 month ago)

Could anybody give me some good tips on this....


Thanks in advance,

Paddo

------------------------------------------------
09/02/2002
Finished the flowhood...thanks to all of you guys who helped me out!






Paddo


Edited by paddo (09/02/02 06:40 AM)


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OfflineAnnoA
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Re: want to construct a HEPA flowhood [Re: paddo]
    #798947 - 08/06/02 01:09 AM (19 years, 1 month ago)

There is a whole section on it in TMC.


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Re: want to construct a HEPA flowhood [Re: paddo]
    #798968 - 08/06/02 01:49 AM (19 years, 1 month ago)

good tips?? please explain yourself better....do you need plans, sources for filters and blowers? what?


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Re: want to construct a HEPA flowhood [Re: CLuB99]
    #799487 - 08/06/02 09:07 AM (19 years, 1 month ago)

I like this Flowhood "tek":

http://www.mycotopia.net/teks/flowhood.html


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Re: want to construct a HEPA flowhood [Re: angryshroom]
    #799511 - 08/06/02 09:19 AM (19 years, 1 month ago)

my flow hood is the same of the link....a 24x12, but....i'm having space problems when working with bags or big jars....
best is a 24x18 hood...enough room to do all your myco job...


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Offlinepaddo
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Re: want to construct a HEPA flowhood [Re: Anno]
    #799708 - 08/06/02 11:12 AM (19 years, 1 month ago)

Are you refering to page 347 to 352 of TMC ,Anno?
If so , this is some great info yes.....but i need more...like some drawings or sommeting or some good pics of some homemade flowhoods...

Do you have one Anno?


Paddo




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Offlinepaddo
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Re: want to construct a HEPA flowhood [Re: CLuB99]
    #799713 - 08/06/02 11:14 AM (19 years, 1 month ago)

Hi,

Do you have some pics of it?
Did you constructed your self?

Thanks in advance,

Paddo


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Re: want to construct a HEPA flowhood [Re: paddo]
    #800085 - 08/06/02 02:26 PM (19 years, 1 month ago)

yes..here we go...




yes i built it...


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Re: want to construct a HEPA flowhood [Re: paddo]
    #800093 - 08/06/02 02:30 PM (19 years, 1 month ago)

how you can see, isn't exactly a beauty thing....but works really good, i count only 2 contaminations on agar since i built it (6 months) , and both not for a faulth of the hood , but of the grower


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Offlinepaddo
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Re: want to construct a HEPA flowhood [Re: CLuB99]
    #800114 - 08/06/02 02:38 PM (19 years, 1 month ago)

wow man looking good!!!
Thanks for posting that!

So what where the total costs if i may ask?



Paddo


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OfflineAnnoA
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Re: want to construct a HEPA flowhood [Re: paddo]
    #800986 - 08/06/02 09:48 PM (19 years, 1 month ago)

This is mine:
http://fungifun.50megs.com/hepa_new/

The cost:
FIlter: 99.997% efficiency, 610x305 mm 70 euro
Blower: 300 cubic meter per hour at 300 Pa : 130 euro
Wood and other thingies: 30 Euro

Sum: 230 euro + 3 hours of work


Edited by Anno (08/06/02 09:53 PM)


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Re: want to construct a HEPA flowhood [Re: CLuB99]
    #801767 - 08/07/02 08:20 AM (19 years, 1 month ago)

hello great job how many cfm


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Offlinepaddo
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Re: want to construct a HEPA flowhood [Re: Anno]
    #802270 - 08/07/02 12:31 PM (19 years, 1 month ago)

Anno,
that is looking very nice, and looks easy to build.

The hole at the back ,is this where you mounted the blower?

And what is resting at the back of the hole? a prefilter?
what kind of prefilter did u use?



And excuse my ignorance , but what does 300PA stands for?


thanks,
Paddo


Edited by paddo (08/07/02 12:40 PM)


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OfflineAnnoA
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Re: want to construct a HEPA flowhood [Re: paddo]
    #802510 - 08/07/02 02:29 PM (19 years, 1 month ago)

>The hole at the back ,is this where you mounted the blower?
I use a axial duct blower which is conected to this hole using a tube.

>And what is resting at the back of the hole? a prefilter?
Yes,

>what kind of prefilter did u use?
a simple furnace filter.

> what does 300PA stands for?

300Pa means 300 Pascal.
100 000 Pa = 1 bar , it?s a pressure unit.

The filter has a resistance which represents itself as a pressure drop at the filter, the so called static pressure.

most HEPAS have a static pressure of 250Pa, and the prefilter is assumed to have 50Pa.

This means that the blower must be able to deliver the required amount of air against this combined static pressure of 300Pa.


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Offlinepaddo
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Re: want to construct a HEPA flowhood [Re: Anno]
    #803449 - 08/07/02 10:25 PM (19 years, 1 month ago)

Ok thanks!
If you could just help me out with this one :

I just orderd this Hepa filter :

HPA-44 610x457x68 .
capacity m3/h frontspeed at 0,45 m/s : 400
Would this be good one?

This one the salesman put in backorder for me because he didnt had it on stock.


But he did had this one in stock:

HPA-43 305x610x68.
capacity m3/h frontspeed at 0,45 m/s : 300

Could i use this one in the same construction as u made?

thanks again,
Paddo.


Edited by paddo (08/07/02 10:31 PM)


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OfflineAnnoA
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Re: want to construct a HEPA flowhood [Re: paddo]
    #803492 - 08/07/02 11:02 PM (19 years, 1 month ago)

I would go with the first one.
I have a setup with the smaller one, but I would be more happier with the first one since it?s 15 cm higher.

How much is it?


>HPA-44 610x457x68 .
>capacity m3/h frontspeed at 0,45 m/s : 400

>HPA-43 305x610x68.
>capacity m3/h frontspeed at 0,45 m/s : 300

Hmm, these data don?t seem quite right. According to Stamets, if you want 100 ft/min (0,50 m/s)frontspeed, then you need a blower with 417 m3/h for the bigger and 260 m^3/h for the smaller blower, if you make the calculation with the efective are, taking into acount that there is a 2.5 cm border at each side of the filter.
Did you also find out the statical pressure of the filters?


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Offlinepaddo
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Re: want to construct a HEPA flowhood [Re: Anno]
    #803550 - 08/07/02 11:50 PM (19 years, 1 month ago)

>How much is it?
95 Euro for the big one
75 Euro for the smaller one


>Did you also find out the statical pressure of the filters?
125 Pa for both

On this page you have the tech specs. :
http://www.acsfilters.com/english/airfilters/hepas.html


Edited by paddo (08/07/02 11:52 PM)


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Re: want to construct a HEPA flowhood [Re: Anno]
    #803626 - 08/08/02 01:01 AM (19 years, 1 month ago)

Where did you buy this HEPA and blower?


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OfflineAnnoA
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Re: want to construct a HEPA flowhood [Re: zeronio]
    #803682 - 08/08/02 02:17 AM (19 years, 1 month ago)

The hepa at
www.czech.at

the blower at
www.psychonaut.at


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Offlinepaddo
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Re: want to construct a HEPA flowhood [Re: Anno]
    #806986 - 08/09/02 12:29 PM (19 years, 1 month ago)

Could somebody convert this for me to metric measurements :
495 cfm .8" static pressure

When i try to convert it on my calculator i'm keeping getting 14.02 M3 p/m
this doesnt seem right to me.

hope anybody can help me.

Thanks,

Paddo



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Offlinepaddo
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Re: want to construct a HEPA flowhood [Re: paddo]
    #807019 - 08/09/02 12:43 PM (19 years, 1 month ago)

figured it out my self :

it was 150 m3 p/m



Paddo


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OfflineAnnoA
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Re: want to construct a HEPA flowhood [Re: paddo]
    #807396 - 08/09/02 04:35 PM (19 years, 1 month ago)

>495 cfm .8" static pressure
>When i try to convert it on my calculator i'm keeping getting 14.02 M3 p/m

You calculated right actually.

It?s 14 m3/min
or 841 m3/h


.8" static pressure is around 200 Pa .


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Offlinepaddo
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Re: want to construct a HEPA flowhood [Re: Anno]
    #807834 - 08/09/02 08:23 PM (19 years, 1 month ago)

hmmmmm,

when you take a look here: http://www.mycotopia.net/teks/flowhood.html

they advice a 495 cfm blower to power a 12"x24" hepa filter figuring .8" static pressure.

maby cfm is cubic foot p/m instead of cubic feet p/m.

if it is cubic foot p/m its is 150 m3 p/m


I dont get it


Paddo


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Re: want to construct a HEPA flowhood [Re: paddo]
    #807875 - 08/09/02 08:49 PM (19 years, 1 month ago)

1 cfm = 1 cubic foot per minute = 1.7 cubic meter per hour


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OfflineAnnoA
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Re: want to construct a HEPA flowhood [Re: paddo]
    #807878 - 08/09/02 08:53 PM (19 years, 1 month ago)

>You will need at least a 495 cfm blower to power a 12"x24" hepa filter figuring .8" static pressure


The 495 cfm are at 0 Pa static pressure, free flow.

Once you place it behind the filter, the output at 200 Pa (= 0.8" ) is much less.


Edited by Anno (08/09/02 08:56 PM)


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Offlinepaddo
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Re: want to construct a HEPA flowhood [Re: Anno]
    #812176 - 08/12/02 07:40 AM (19 years, 1 month ago)

Hi,

received my HEPA filter today...here some pics:

Front:


Back:


Info sticker:



Just looking for the right blower now.....

Paddo


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Re: want to construct a HEPA flowhood [Re: paddo]
    #813881 - 08/12/02 11:24 PM (19 years, 1 month ago)

Did you ever find your blower?


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Re: want to construct a HEPA flowhood [Re: Roadkill]
    #813884 - 08/12/02 11:27 PM (19 years, 1 month ago)

Not yet,

Still not sure wich i have to buy.


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Re: want to construct a HEPA flowhood [Re: paddo]
    #813953 - 08/13/02 12:45 AM (19 years, 1 month ago)

looking really good


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Re: want to construct a HEPA flowhood [Re: paddo]
    #814007 - 08/13/02 02:41 AM (19 years, 1 month ago)

Looks good...but why didn?t you go with the 610x457 mm filter?


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Offlinepaddo
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Re: want to construct a HEPA flowhood [Re: Anno]
    #814667 - 08/13/02 10:56 AM (19 years, 1 month ago)

Well Anno,

They didnt had it on stock and i had to wait for 2 months.
And i hate waiting .

So this was the one i ordered,
and i'm only goin to use to inoculate petri's and jars.
no bags etc.
So i think this will be big enough.

Could you help me to decide wich blower sutes best?

Thanks,
Paddo


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Re: want to construct a HEPA flowhood [Re: paddo]
    #814671 - 08/13/02 11:01 AM (19 years, 1 month ago)

Did you find a company that sells blowers?


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Re: want to construct a HEPA flowhood [Re: Anno]
    #814676 - 08/13/02 11:04 AM (19 years, 1 month ago)

yep,
a couple, but i think this one is the best and its just 5 minuts driving from here.

www.interpolm.nl


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Re: want to construct a HEPA flowhood [Re: paddo]
    #814720 - 08/13/02 11:23 AM (19 years, 1 month ago)

Well, they have radial fans:
3.1 RADIAL FANS Torin
700 m3 ( 90 watt) 91,00

You should ask for data sheet and look it up how much output this fan has at 125+50 or better yet 200Pa.
It should have 300 m3/h at 180-200 Pa if you want to use it.


Edited by Anno (08/13/02 11:41 AM)


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Re: want to construct a HEPA flowhood [Re: paddo]
    #814736 - 08/13/02 11:31 AM (19 years, 1 month ago)

High Paddo,

Thanks for this topic, I enjoy your impatiance very much

And it is nice to now there will be soon a new flowhood builder here in Holland.
Thanks to all you guys who replied!!!

Good luck with the assembling. MAybe you can write a dutch build a flowhood and place it on the Smartboard?


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Re: want to construct a HEPA flowhood [Re: Anno]
    #814759 - 08/13/02 11:39 AM (19 years, 1 month ago)

Anno thanks man!!!
Your the greatest!

Gonna give them a call tomorrow.
I'll let you know about the details.

I think i'm gonna make a pictorial about this project

Paddo


Edited by paddo (08/13/02 11:44 AM)


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Offlinepaddo
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Re: want to construct a HEPA flowhood [Re: MeneerCactus]
    #814768 - 08/13/02 11:43 AM (19 years, 1 month ago)

Eric,
thats a good idea!

When i'm ready i'm gonna make a dutch pictorial to.


Paddo


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Re: want to construct a HEPA flowhood (UPDATE) [Re: Anno]
    #817016 - 08/14/02 09:10 AM (19 years, 1 month ago)

this far i came today :





Tomorrow more..

Paddo


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Re: want to construct a HEPA flowhood (UPDATE) [Re: paddo]
    #823187 - 08/17/02 10:25 AM (19 years, 1 month ago)

wow... looking very trim there.
My gorilla just finished building his flowhood today and is very excited about it. I'll see if I can get him to post some pics of it soon.
It is using a large furnace fan with a 2X2 ft (609.6X609.6mm) HEPA and a dual layer electrostatic pre-filter (nothing fancy just a double layer of a special allergen furnace filter).
mmmmmm... gorilla like


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Re: want to construct a HEPA flowhood *UPDATE* [Re: paddo]
    #933817 - 10/05/02 04:08 AM (18 years, 11 months ago)

I just noticed that you had updated your first post with the finnished product.

Great job!!!

Looks really nice.....how is it working??



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Re: want to construct a HEPA flowhood *UPDATE* [Re: Roadkill]
    #1913528 - 09/13/03 08:36 PM (18 years, 19 days ago)

allright so if im shitty at math, and i dont know the specs of my hepa, cani just guess how much power to put behind a blower by getting on overpowered one, and use a dimmer switch to control how fast it goes, then just check by making sure it only blows out a match at about 2 feet away form the filter? lettme know if this sounds ok, im a broke ass and has the items just laying around my house to make such a thing and i think itd be a hell of a lot better then me sittin in my boxers in my bathroom inhaling mad lysol right?
well thanks for the input


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Re: want to construct a HEPA flowhood *UPDATE* [Re: paddo]
    #1914674 - 09/14/03 05:32 AM (18 years, 19 days ago)

Now thats beautifull. What are your contam rates, after finishing this motherf*****.

5 Shrooms  :thumbup: 


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Re: want to construct a HEPA flowhood *UPDATE* [Re: Wheedhead!]
    #2902996 - 07/18/04 05:53 PM (17 years, 2 months ago)

Yo Quintus, if you want any help or tips building a hood like this, ask away..

Paddo (alex)


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Re: want to construct a HEPA flowhood *UPDATE* [Re: paddo]
    #2904576 - 07/19/04 07:07 AM (17 years, 2 months ago)

You guys are going *way* overboard... You just need some clean air, not a hurricane. A standard 3 x 9 filter (from Walmart)that costs $19.95 will do just fine. You need a decent blower, but chances are that almost any decent sized blower running on 110v AC current will do just fine for you.

It looks like you guys went after the biggest heating/AC blowers that you could find... Way overkill. Try a blower about half the size of the ones pictured above.


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Re: want to construct a HEPA flowhood *UPDATE* [Re: fastfred]
    #2904580 - 07/19/04 07:11 AM (17 years, 2 months ago)

Do you speak out of experience or pure speculation?


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Re: want to construct a HEPA flowhood *UPDATE* [Re: Anno]
    #2914836 - 07/22/04 05:11 AM (17 years, 2 months ago)

My friend Sanchez has a nice big flow hood for his edible/medicinal mushroom work, which I built for him.

The first design used the smallish $40-$50 hepa filter that walmart sells. Turn it upside down and use a little weatherstripping for the connection. I also duct taped the seams and hotglued the hepa seal. Worked fine, verified with open petri dishes. The second design used a surplus blower ($15 at allelectronics.com [all gone though]) and the same filter. Place the filter on your hood and trace around the bottom. Now cut that section out, and insert the filter upwards from the inside of the hood. Hot glue or caulk in place. The interface between the filter and the blower can be made by placing a plastic container upside down over the filter and then connecting some dryer vent tubing from that to the blower. You can stuff the plastic box or tubing with some polyfill as a prefilter.

This design also verified in the same manner. The design is based on simplicity. The only airtight joint required is that of the hepa to the hood. Use a large piece of plexiglass for the front. Cut some sort of grove into the sides of your hood to accept the plexiglass. An adjustable front allows for maximum flexibility in airflow and accepting large objects. Hepa air input in the top rear, and exaust at the bottom of the front.

Open your P. cooker in there or right in front of it! No class five tornado required. One of the differences in others posts seems to be that the entire front is open. In that case you may need a lot of airflow. The big scientific ones sure don't have the entire face open. You can just build them so much bigger if you use an adjustable front.

Earlier, I mentioned a 3x9 filter... It may be as large as around 4x10. Not exactly sure because as mentioned above I never had to measure it. But, it is the one that costs $20-$25 at walmart. (1pk vs 2pk price)


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Re: want to construct a HEPA flowhood *UPDATE* [Re: fastfred]
    #2914887 - 07/22/04 05:57 AM (17 years, 2 months ago)

>One of the differences in others posts seems to be that the entire front is open.
This is the standard for mushroom cultivation flowhoods since it allows for easy handling of the jars, bags and dishes in front of the hood.

>In that case you may need a lot of airflow.
Indeed.

>The big scientific ones sure don't have the entire face open
As I said, this is a hood for mushroom cultivation, not for scientific experiments.


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Re: want to construct a HEPA flowhood *UPDATE* [Re: Anno]
    #2931563 - 07/27/04 07:50 AM (17 years, 2 months ago)

Your point is moot since most flow hoods have a front that opens nearly 100%.

If you buy into this massive overkill, go right ahead. There is no way that I can see it hurting any. Although it's a waste of resources which could be better spent elsewhere.

The massive $450 hood certainly looks scary, even if it is no more effective than the $100 one that I describe.


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