If the Krown Fan Filter Unit is ducted and removing the duct is not possible, follow the below instructions for balancing:
Step 1:
Turn off primary air source.
Step 2:
Install an air pressure measurement device (i.e. Pitot tube) in the duct prior to the Krown Fan Filter Unit inlet.
Step 3:
Power up Krown Fan Filter Unit and set speed controller to desired airflow. See Airflow Setpoint section to determine
initial setpoint.
Step 4:
Power up the airflow control device. (Ductwork should have been previously balanced)
Step 5:
Read the inlet pressure.
Step 6:
Measure airflow using flow hood.
Step 7:
Using the table below, adjust Krown Fan Filter Unit controller, or upstream airflow device as required
Repeat steps 4-6 until desired airflow and inlet pressure (0.0 ± 0.05” w.g.) is achieved..
FFU Airflow
FFU Inlet Static (measured)
Action
Above Set point
Above desired pressure
Decrease airflow on airflow control device
Above Set point
Below desired pressure
Decrease Krown Fan Filter Unit control setting
Above Set point
At desired pressure
Decrease Both Krown Fan Filter Unit and airflow control device
Below Set point
At desired pressure
Increase Both Krown Fan Filter Unit and airflow control device
Below Set point
Below desired pressure
Increase airflow on airflow control device
Below Set point
Above desired pressure
Increase Krown Fan Filter Unit control setting
For more information visit
KeystoneCleanAir.com
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Fan Filter Units |
Balancing
