An amca standsrd 210 double chamber is used to accurately measure air volume and static pressure.

Ust of equations and variable

Q:Air Volume=60XCXπ/4XD²=M2g/rxPn（m³/min）

C:Coefficient of nozzle air volume

r:Air Density=1.293

T:Temperature(°C)

P:Air pressure(mmH2O)

Pn:Differential pressure of air volume(mmH2O)

Ps:Static pressure(mmH2O)

g:9.8m/sec²

Maximum static pressure and maximum air volume measurements must be taken separately.

Maximum static pressure measurement:When the nozzle is closed,the pressure in chamber A will reach a maximum.The pressure difference Ps represents the maximum static pressure achievable by the fan.

Maximum air volume measurement:The nozzle is opened and the auxiliary blowers is used to lower the pressure in chamber A to Ps=0. The maximum air volume can then be calculated using Pn,D and the air volume equation above.Q represents the maximum achievable airflow with the fan in free air.