Measurements & Conversions

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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.