Air changes n cfm

(Sajjad Ahmad) #1

how to calculate cfm and air changes?

(amit chauhan) #2

Average velocity (V) = --------------------------- = _______Ft. / min.
Area of grill (A) = Length in ft. X Breadth in ft. = ________ Sq. Ft.
Air flow per grill (F) = V X A = ________CFM.
Air flow of the Room (T) = ___________CFM
Room Volume ® = __________Cu. Ft.
T X 60
No. of Air Changes / hour (ACPH) (N) = ----------

(Sajjad Ahmad) #3

(amit chauhan) #4

thanku sir for your valuable reply

(Sajjad Ahmad) #5

well come

(Md. Saifullah Khan) #6

What is cfm & its significance?

(Sajjad Ahmad) #7

cfm is cubic feet per min.
blower cacacity of AHU is in cfm which then decides air changes.

(Md. Saifullah Khan) #8

Is this equation to calculate dryer air or atmosphere air?

(Sajjad Ahmad) #9

AHU air

(Sajjad Ahmad) #10