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Offlineswinghigh
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Registered: 07/23/20
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need verification on flow hood build
    #26961972 - 09/30/20 12:41 PM (3 years, 3 months ago)

looking for someone who has experience with HEPA filters and blowers. i want to make sure what im buying is correct, ive been threw months of research and hunting and i think ive found what i need the problem was i had found a filter that was 24x24x4 7/8 it had specified that it was .09 wg at FInal resistance.......i stupidly took this as the resistance of the filter and bought the filter and the fan according to the 0.9wg.......i received the filter and it specified on the filter that it is a 0.29wg @350cfm so the issue was the blower i bought was way way to powerfull for that resistance of .23wg so i returned the blower and purchased a new blower that i think should work.

so this is what ive worked out after reading a shit ton more when the filter says Recommended Final Resistance 0.9 on the website thats the resistance at witch you throw the filter out so when the filter reaches 0.9 static pressure its garbage and why it says on the filter .29" @ 350 cfm is because the initial resistance brand new is .29" at the working air pressure of 350 cfm.................................

.Ok now... paul stamets says that the air speed of the air flowing from the filter surface should be (at least) 100 fpm to achieve laminar flow.........so thats where the 100ft/min x surface area comes in.....so for me being 24"x24" it would be 100ft/min x 4ft² = 400cfm

so 400cfm is the amount of air my blower must deliver at the sum of the STATIC PRESSURE (or WG) OF THE HEPA FILTER + prefilter

...........so my filter has a WG of .29" and the pre filter will be .02  so that amounts to a total of 0.49 WG

............the new blower fan chart states @ 0.50"SP the fan will produce 420CFM

............so from my understanding that fan should be good to go but man i got something bugging me like i missed something with the math......like its something with the .29 @ 350cfm thats bugging me i dunno why though. also when i talked to a HVAC tech he told me the resistance of that filter without any CFM rating is .43wg so what resistance rating should i have used the .29wg @350 cfm or the .43wg @ 0 cfm ??????


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