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 Sci-Fi
Lover and a Dreamer
Registered: 02/28/10
Posts: 1,228
Loc: Santa Cruz
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I like the bounce house fan. It's made for some serious static pressure. I would use one of those with a big merv 12 prefilter and encase the fan in a box lined with fiberglass to control the sound. Remember that if you get a big ass fan you can extend the life of your HEPA and improve the filtration with a badass prefilter.
Lets say there are 1,000,000 spores and bacteria between 0.3 and 1.0 microns in size that enter two different flow hoods.
Setup A has a HEPA rated at 99.97% and no prefilter.
300 contams pass through
Setup B has a prefilter that removes 70% of particals 0.3 to 1.0 micron the HEPA removes 99.97% of what is left.
90 contams pass through
Then again we're not building a space station. It will work fine either way.
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Sci-Fi
Lover and a Dreamer
Registered: 02/28/10
Posts: 1,228
Loc: Santa Cruz
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I like the bounce house fan. It's made for some serious static pressure. I would use one of those with a big merv 12 prefilter and encase the fan in a box lined with fiberglass to control the sound. Remember that if you get a big ass fan you can extend the life of your HEPA and improve the filtration with a bad ass prefilter.
Lets say there are 1,000,000 spores and bacteria between 0.3 and 1.0 microns in size that enter two different flow hoods.
Setup A has a HEPA rated at 99.97% and no prefilter.
300 contams pass through
Setup B has a prefilter that removes 70% of particals 0.3 to 1.0 micron the HEPA removes 99.97% of what is left.
90 contams pass through
Then again we're not building space stations. It will work fine either way.
Edited by Sci-Fi (03/30/10 09:27 AM)
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Prisoner#1
Even Dumber ThanAdvertized!
Registered: 01/22/03
Posts: 168,343
Loc: Pvt. Pubfag NutSuck 
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 Re: Technical flowhood questions  [Re: Sci-Fi]
#12297501 - 03/30/10 08:29 AM (3 years, 1 month ago) |
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Quote:
Sci-Fi said:
How loud is that thing pris? Big vacuums are some times crazy loud. My shop vac is at least twice as load as my 845 CFM flow hood fan.
the one I have has an induction motor, you wont hear the motor it's self
but will hear the fan so it's not nearly as loud as a shopvac which has a
universal motor... those fuckers are noisy as hell
--------------------
there are 923 words in the english language that do not follow the "I before E"
rule, there are 44 words in the english language that follow the rule. this is
the shit our education funding is paying for and these liberals want more money
for education to keep making students stupid
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 ScavengerType
Registered: 01/25/08
Posts: 5,755
Loc: The North
Last seen: 5 days, 4 hours
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Re: Technical flowhood questions [Re: Prisoner#1]
#12300694 - 03/30/10 07:00 PM (3 years, 1 month ago) |
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I'll go check it out then prizo.
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"Have you ever seen what happens when a grenade goes off in a school? Do you really know what you’re doing when you order shock and awe? Are you prepared to kneel beside a dying soldier and tell him why he went to Iraq, or why he went to any war?"
"The things that are done in the name of the shareholder are, to me, as terrifying as the things that are done—dare I say it—in the name of God. Montesquieu said, "There have never been so many civil wars as in the Kingdom of God." And I begin to feel that’s true. The shareholder is the excuse for everything."
- Author and former M6/M5 agent John le Carré on Democracy Now.
Conquer's Club
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b2b
b2b
Registered: 08/09/12
Posts: 15
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Re: Technical flowhood questions [Re: Sci-Fi]
#16671725 - 08/09/12 04:58 PM (9 months, 4 days ago) |
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Hi,
I have a quick question about uneven air flow. I have made a basic laminar flow hood using the examples found online. I got a HEPA 99.97% filter (19" X 16" X 2") and 270 CFM fan.
What I noticed is that the air flow is not the same at different points of the filter. In one corner it is much higher then in others.
I would like to know if anyone had an issue like this and is there a fix?
Thanks.
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