permeability for media in air filters
 

I am tryin to simulate flow through the housing of an air filter.
And for the media I am giving the material as resistance.
Now, I need to enter Permeability value where the units are in m2 but the values which I have for the media air permeability is in CFM(cubic feet per minute).
I dont know how to input the value of air permeability for the media
Pls help guys!!!!:confused: