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Anonymous
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Construction of a Flowhood
#5277961 - 02/08/06 03:06 PM (17 years, 11 months ago) |
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I have a blower and a 24x18 HEPA filter. How big should my box be? I am not sure how big I should cut all of the wood pieces? Any help is greatly appreciated.
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RogerRabbit
Bans for Pleasure


Registered: 03/26/03
Posts: 42,214
Loc: Seattle
Last seen: 11 months, 3 days
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Re: Construction of a Flowhood [Re: Anonymous]
#5278044 - 02/08/06 03:29 PM (17 years, 11 months ago) |
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You want a plenum behind the filter with as close to the same cubic inch capacity that the filter itself will use. In other words, if your filter is ten inches thick, have at least ten inches behind the filter for pressure to build in. That area of even pressure behind the filter is how laminar flow is achieved. Be sure to seal very well around the edges of the filter. Any unfiltered air that leaks around the edges will ruin your projects. RR
-------------------- Download Let's Grow Mushrooms semper in excretia sumus solim profundum variat "I've never had a failed experiment. I've only discovered 10,000 methods which do not work." Thomas Edison
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Anonymous
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Re: Construction of a Flowhood [Re: RogerRabbit]
#5278103 - 02/08/06 03:41 PM (17 years, 11 months ago) |
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Okay. Great that I have the the rabbits attention. I admire your work. My HEPA filter is on fungi.com..It is 24x18x5.8....My blower would barely fit on top of that. Is it going to hurt...I don't know.
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agar
old hand


Registered: 11/21/04
Posts: 9,056
Loc: Somewhere Else
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Re: Construction of a Flowhood [Re: RogerRabbit]
#5278105 - 02/08/06 03:41 PM (17 years, 11 months ago) |
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RR is 110% correct.
 I had to reseal the filter in this one TWICE. A tiny unsealed area, the size of a human hair, F/U the works.  Until, I found the flaw & resealed it. 
 Fan OFF
 Fan ON
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ohmatic
searcher


Registered: 02/28/04
Posts: 6,742
Loc: europe
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Re: Construction of a Flowhood [Re: agar]
#5278113 - 02/08/06 03:43 PM (17 years, 11 months ago) |
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check out this very good document on how to construct a flowhood: http://fungifun.org/flowhood/ peace ohm
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MONOTUB tek HEATBOMB tek RIP #cultivation! ....can't associate? well FUCK U !
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Anonymous
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Re: Construction of a Flowhood [Re: ohmatic]
#5278124 - 02/08/06 03:45 PM (17 years, 11 months ago) |
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I've been reading that document. I don't see anything there about the size of the plenum though. Maybe I overlooked it.
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ohmatic
searcher


Registered: 02/28/04
Posts: 6,742
Loc: europe
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Re: Construction of a Flowhood [Re: Anonymous]
#5278210 - 02/08/06 04:04 PM (17 years, 11 months ago) |
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the whole fan is embedded behind the filter, that basically IS the plenum. also there is space between the "fanbox" and the filter. peace ohm
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MONOTUB tek HEATBOMB tek RIP #cultivation! ....can't associate? well FUCK U !
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Anonymous
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Re: Construction of a Flowhood [Re: ohmatic]
#5278328 - 02/08/06 04:34 PM (17 years, 11 months ago) |
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The fan is embedded on top of the plenum. The air hits the bottom and pretty much makes a 90 degree turn and into the HEPA filter.
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ohmatic
searcher


Registered: 02/28/04
Posts: 6,742
Loc: europe
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Re: Construction of a Flowhood [Re: Anonymous]
#5278416 - 02/08/06 04:55 PM (17 years, 11 months ago) |
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the idea is that the box itself IS the plenum.

same goes for this design, but it has an additional "plenum" space as you can see.

so its up to you how u construct it, as anno built both of these hoods i am quite sure he knew what he was doing  peace ohm
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MONOTUB tek HEATBOMB tek RIP #cultivation! ....can't associate? well FUCK U !
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Anonymous
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Re: Construction of a Flowhood [Re: ohmatic]
#5278465 - 02/08/06 05:10 PM (17 years, 11 months ago) |
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I don't really see a difference in either one of these. Lol. I was asking how big to make the box. What would you suggest?
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ohmatic
searcher


Registered: 02/28/04
Posts: 6,742
Loc: europe
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Re: Construction of a Flowhood [Re: Anonymous]
#5278478 - 02/08/06 05:18 PM (17 years, 11 months ago) |
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As big as your fan is, if you want to fit it inside. peace ohm
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MONOTUB tek HEATBOMB tek RIP #cultivation! ....can't associate? well FUCK U !
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Anonymous
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Re: Construction of a Flowhood [Re: ohmatic]
#5278490 - 02/08/06 05:25 PM (17 years, 11 months ago) |
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I figured I would make the fan sit on top. That way it would have more room inside. My filter is 24x18x5.8. Will a 24"x18" rectangle work?
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