O
Obtuse
- 13
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You can't really get true negative pressure without a seriously air tight room. You're talking about a vacuum right? If you compare the CFM (cubic feet per minute) of the fans you're using you could easily assume that if the intake fan is 80CFM and the out-take fan is 120CFM then you are effectively moving more air out than in and would then get a strong vacuum created. I don't know if that helps.
Except that resistance in the system is often not even.
That is, your exhaust fan will often be pulling or pushing through a filter, and often will have a longer duct run. That results in a drop in cfm.
Your intake fans will often be less restricted, and loose less cfm.
5 x 9 x 6.5 = 292.50 cubic feet
292.50 / 5 min = 58.5 cubic feet per minute
The exhaust fan needs to be rated to at least 58.5 cfpm
So as I have read. A fan need to be rated to completely replace the air volume in 5 minutes. Using my own tent set up:
5 x 9 x 6.5 = 292.50 cubic feet
292.50 / 5 min = 58.5 cubic feet per minute
The exhaust fan needs to be rated to at least 58.5 cfpm
So as mentioned any fan rated for and running above that number and all other things being equal will create a NEGATIVE AIR PRESSURE.
Why would i regurgitate all that?
My 292.50 cf are being exhausted not with a 58.5 cfm but with a 600 cfm and there is a VERY NOTICEABLE NEGATIVE AIR PRESSURE FROM THE LOOK OF THESE WALLS!!! There is at least 3" of bowing on all the walls. This fan is a 8" 600 cfm, I have it neck down to a 6" (port size on tent). There is one 3' x 6" screened flap open for intake.
....and there it is
Sorry. Bad hash
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