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30rack
Stranger

Registered: 06/22/11
Posts: 27
Last seen: 10 years, 8 months
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laminar flow hood: filter, fan, and math
#18508215 - 07/03/13 07:14 PM (10 years, 10 months ago) |
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*I realize there are countless threads on this subject, I read through some of the recents and couldnt exactly find what I want
I am in the process of building a laminar flow hood, and I need to make sure I understand the math correct, the equations of which I found at http://www.fungifun.org/English/Flowhood/.
based on the website, i made a excel calculator to do the math on a different filter for myself. it shows the same results as the site, so I am fairly confident I am doing this correct. I am unsure, however, how to factor in filter depth (is it relevant?)
the first filter I considered for use is this: http://www.homedepot.com/p/GE-Air-Purifier-HEPA-Filter-RAPHF3/203051809#.UdTJbPb3KYo
questions: is this filter adequate for a small flow hood? I worry because it is not as deep as more expensive models, but it is still rated for 99.97% efficiency.
the math works out to 218 CFM at static pressure (?) and I believe this is with consideration for a furnace pre-filter included
This filter is a little bigger, and a little beefier: http://www.ebay.com/itm/261236688995?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
yes the auction is closed, i am certain I can find another.
The math on this one works out to 800 CFM at static pressure. -I believe this filter is rated for slightly better cleaning ability. if it is not necessary, I would like to use the first filter from home depot but I am in no way against this one.
-I found blowers to work with both which can accept a rheostat to adjust flow rates.
questions:
did I do the math right?
Am I understanding this "static pressure" thing as how much flow needs to be going against the filter to begin flow-through? as in, will I need a fan which blows more than this for expected results?
Edited by 30rack (07/03/13 07:15 PM)
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Edon
Seeker



Registered: 05/28/13
Posts: 192
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Re: laminar flow hood: filter, fan, and math [Re: 30rack]
#18509001 - 07/03/13 09:43 PM (10 years, 10 months ago) |
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I would also be interested in hearing what the more knowledgeable have to say about this. I was considering using a thin 1 inch filter like this stacked with a 1 inch electrostatic filter. I have no experience with building flow hoods but would guess there is some reason the much deeper filters is what everyone else is using.
Do you think 17.5" X 18" is big enough of a work area? I was considering a 16" X 24" filter.
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