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OfflineLittleshroom
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Flow Hood fan too week
    #18744827 - 08/22/13 10:44 PM (10 years, 5 months ago)

So I have been making a flow hood and its all going well. However, today I tested the airflow before I finished making the top box and  it's too weak, only pushing my lighter flame like 45 degrees right next to it. It is a 450 CFM inline fan (hydroponic store) caulked into the top of my box, like a 2 foot cube with half its volume filled by my HEPA. So I'm shopping and this one catches my eye by the cheapness and I'm thinkin that 650 CFMs at least would be enough to blow this thing even after I put the top box and filter together. Is this sounding right? I need to post a picture tomorrow, but here's my prospective...


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OfflinePussyFart
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Re: Flow Hood fan too week [Re: Littleshroom]
    #18745038 - 08/22/13 11:52 PM (10 years, 5 months ago)

You need a blower, not a fan....


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OfflineLittleshroom
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Re: Flow Hood fan too week [Re: PussyFart]
    #18746505 - 08/23/13 10:09 AM (10 years, 5 months ago)

Hmmm I just looked up the difference between a fan and a blower...essentially any fan inside a housing is a blower, but I guess I need a blower that just works at higher pressures than the one I have...how do I know how well it will blow at a certain pressure? I thought all my airflow calculations were correct so I guess the only thing they didn't count in was the pressure or something. So I could probably just find a blower at the same 450 CFMs and it will work. Thanks for the help


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OfflineLittleshroom
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Re: Flow Hood fan too week [Re: Littleshroom]
    #18765270 - 08/27/13 06:35 PM (10 years, 5 months ago)

Wait... do you need to calculate the volume the HEPA filter takes up in the flow hood when calculating CFM and blower requirements?


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