Measurements & Conversions

An AMCA Standard 210 double chamber is used to accurately measure air volume and static pressure.

Air Volume and Staic Air Pressure Chamber


Note : Fan performance is calculated using the data obtained from this equipment according to the following formula:

The Equation : Air flow Airflow Formula
C : Coefficient of nozzle air flow
D : Diameter of nozzle (m)
r : Air density Air Density Formula
   
t : Temperature (oC)
P : Air pressure (hPa)
Pn : Differential pressure of air flow (Pa)
g : 9.8m/s2

Use the tables of multipliers below to convert between units.

         Airflow
CFM m3/min m3/hr L/sec
1 0.028 1.7 0.47
35.3 1 60 16.7
0.59 0.017 1 0.28
2.12 0.06 3.6 1
 
       Example: To convert from CFM to m3/hr multiply by 1.7.

         Static Pressure
in H2O mm H2O Pa
1 25.4 249
0.039 1 9.81
0.004 0.1 1


       Example: To convert from Pa to in.H2O multiply by 0.004.