Air changes n cfm


(Sajjad Ahmad) #1

how to calculate cfm and air changes?


(amit chauhan) #2
                                  V1+V2+V3+V4+V5

Average velocity (V) = --------------------------- = _______Ft. / min.
5
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) = ----------
R


(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

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