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Offline30rack
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Registered: 06/22/11
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laminar flow hood: filter, fan, and math
    #18508215 - 07/03/13 07:14 PM (10 years, 8 months ago)

*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?


--------------------
My badass incubator/fruiting chamber: http://www.shroomery.org/forums/showflat.php/Number/18651749

My beefy pasteurizer: http://www.shroomery.org/forums/showflat.php/Number/18649670

Edited by 30rack (07/03/13 07:15 PM)

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InvisibleEdon
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Re: laminar flow hood: filter, fan, and math [Re: 30rack]
    #18509001 - 07/03/13 09:43 PM (10 years, 8 months ago)

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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