Formula to calculate negative pressure in an enclosure

[billhodder]

Enclosure 5120 Cubic Meters

Negative air unit 4000 Cubic Feet Per Minuite

How many air changes per hour.
I get 1 every 45 minuites ????

 

[Raiddinn]

I am no expert so take this with a grain of salt.

1 cubic foot should be 1/27 of a cubic meter approximately.

That would mean your unit would be sucking out about 148 cubic meters per minute.

Divide 5120 total cubic meters by 148 per minute and you are looking at at about 35 minutes to pull everything out.

That is all just off the top of my head guesstimate numbers, so feel free to get more exact figures and plug them into the same calculations instead.