Balancing Ducted Supply – Pressure Independent and Dependent Airflow Control
NOTE:
If there is a pressure independent device upstream of the Krown Fan Filter Unit then PSC or ECM with constant torque
motors should be used.
Ducted Unit: Constant Torque Krown Fan Filter Unit with
Upstream Pressure Independent Terminal
Ducted Unit: Constant Flow Krown Fan Filter Unit with Upstream Pressure
Dependent Terminal and Manual Damper
If Krown Fan Filter unit is not
already installed:
Step 1:
Set Krown Fan Filter Unit
with filter installed on benchtop and
set to desired airflow. See Airflow
Setpoint section to determine initial
setpoint.
Step 2:
Confirm airflow using
a flow hood and adjust speed
controller as required.
Step 3:
Ensure each supply air duct
is balanced to scheduled airflow
and matches Krown Fan Filter Unit
set point.
Step 4:
Turn off primary air source.
Step 5:
Install Krown Fan Filter Unit
into ceiling, connect ductwork.
Step 6:
Turn all Krown Fan Filter
Units on – ensure all are running
before proceeding to next step.
Step 7:
Turn on primary air source.
Step 8:
Measure airflow using
flow hood and compare against
scheduled flow. Krown Fan Filter
Unit inlet static should be verified to
be neutral. See table below if proper
operation is not achieved.
For more information visit
KeystoneCleanAir.com
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Fan Filter Units |
Balancing
