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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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InvisibleBrainiac
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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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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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InvisibleMycoCakeEater
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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.


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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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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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OfflineRogerRabbitM
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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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