Negative pressure formula
Negative pressure formula
(OP)
Is there any formula with which I can determine the cfm needed to eliminate the negative pressure inside a room, if I know the volume and negative pressure? We have fans blowing in and out, we need more blowing in, but without knowing the capacity of each fan, it is quite difficult for me to come up with anything. Appreciate it in advance.





RE: Negative pressure formula
Good luck,
Latexman
RE: Negative pressure formula
RE: Negative pressure formula
RE: Negative pressure formula
RE: Negative pressure formula
Think of it like this: you have a pond with a stream going in and a stream going out. If your goal is to keep the pond at the same level, it doesn't matter how wide or deep the pond is. The only thing that matters is the flow into and out of the pond.
You need to know how big the various fans are to solve this problem.
-b
RE: Negative pressure formula
RE: Negative pressure formula
The fan cfms are not needed unless you want to assure a certain number of air changes per hour.
If you "heard" it on the internet, it's guilty until proven innocent. - DCS
RE: Negative pressure formula
RE: Negative pressure formula
Now simply measure each of the supply fan cfms at this condition.
The total cfm is obviosuly the sum of all the measured supply cfms.
RE: Negative pressure formula
If all your worried about is the air pressure I suggest installing a recirculation duct from your high pressure output back into the room and control the air flow with a make up damper. Or you could recirculate the air into the inlet stream to the room and increase that pressure also.
Good Luck!