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xerox
Milk Burgers

Registered: 06/01/14
Posts: 2
Last seen: 9 years, 1 month
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Hepa > Blower~Specific matching~24x24x12 & 6ft airstream
#21338253 - 02/27/15 12:46 PM (9 years, 2 months ago) |
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Ive looked at other posts and I want to be certain my decision is correct. From what Im gathering, I need a 350cfm~600cfm squirrel cage fan.
Q1: What cfm do I need? Q2: Is there a such thing as too much cfm? Q3: Would you mind linking to a prefilter that would be good? Q4: What is W.G.?
Outside Links: How do I match a blower to a HEPA filter
The Control:
Astrocell I Hepa Filter measures 24"x24"x11.5" Penetration (.016) % Pen. @ 20% (.023) % Resistance (.9) W.G. Test Flow 1000 CFM
Workspace dimensions: 2'x 6~8' Flush against wall on one 2' side. Flowhood may be on either side of table.
Variables:
~If the flowhood is flush with the wall, I lose 2 feet of workspace. ~If the flowhood is on the otherside, I may get air bouncing off back wall.
Conclusion:
After reading others' trial and error, I have concluded that a 365 cfm squirrel cage blower for around $30 that will limit the workspace to directly in front of the flowhood. After reading the link specified above, I have concluded that Im not as good at math as I first thought I was.
Quote:
1. Find out the area of your filter by multiplying the width and the hight in feet (for instance the smallest reasonably usable filter would be 2ft x 1ft)
2ft x 2ft = 4 ft2
Quote:
2. Multiply the required air speed(the one Stamets specifies) with the area of your filter
100 ft/min x 4 ft2 = 400 ft3/min
That is as far as I could make it. I dont speak english!
Thank you all for your assistance!
Edited by xerox (02/27/15 01:02 PM)
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PirateSwazey


Registered: 12/12/12
Posts: 2,993
Loc: Here, Now
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Re: Hepa > Blower~Specific matching~24x24x12 & 6ft airstream [Re: xerox]
#21341142 - 02/28/15 12:32 AM (9 years, 2 months ago) |
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You need a blower that will push 400cfm @ .9" of WG, if you don't use a pre-filter.
Most pre-filters have .2" of SP so it would be safe to get a blower that moves 400CFM @ 1.2" WG when adding one.
W.G. = water gauge (same as SP or static pressure), it is basically a measurement for resistance.
Blowers are rated for output at different levels of WG, so it is important to find a blower that moves the amount of air you need at the sum of your HEPA filter & pre-filter's static pressure (W.G.)
If you overshoot the CFM a bit you can regulate it by either choking the fan (blocking some of the intake) or by adding a speed controller.
http://www.shroomery.org/forums/showflat.php/Number/19798444/fpart/1/vc/1
^ link to my flowhood thread -- it might help you a bit
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xerox
Milk Burgers


Registered: 06/01/14
Posts: 2
Last seen: 9 years, 1 month
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Re: Hepa > Blower~Specific matching~24x24x12 & 6ft airstream [Re: PirateSwazey]
#21341716 - 02/28/15 06:51 AM (9 years, 2 months ago) |
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your tutorial is an excellent essay! Thank you!! Very concise! Perfect!
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