1200cfm fan create enough pressure to open a 12" backdraft damper?

mikeross · Aug 21, 2020

I've never used backdraft dampers before, never even seen one in person.

I have a 15'w x 26'l room that I plan to have an 1200cfm exhaust on one end just to vent the room during lights off. On the other end I plan to have a 12" vent with a backdraft damper. Now in theory, if the room is truely sealed tight this 12" inline fan on the other end of the room should open up this damper right?

Any insight is much appreciated... thanks!

Aqua Man · Aug 21, 2020

Will depend on the force required to open the damper. You will lose some efficiency. How much I cant say

HHHcleanroom · Oct 6, 2020

I would think that its a matter of Differential Pressure. I am seeing Fabric BDD that are activated by a pressure gradient of 1.5" Water Column. That room volume, assuming 8" ceiling, you would be generating free air flow of 23 room air changes per hour. If its sealed right I would think that you could generate 1.5" water column. It would be simple experiment to determine if you could generate that type of pressure differential.

1200cfm fan create enough pressure to open a 12" backdraft damper?

1200cfm fan create enough pressure to open a 12" backdraft damper?

mikeross

Aqua Man

HHHcleanroom

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