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What is Pressure Drop?
The air performance of a damper is described by the pressure drop across the damper.
So what is pressure drop?
Pressure drop can be defined as the resistance to airflow across an open damper
and increases as turbulent flow increases. Actual pressure drop is dependent upon
many factors. This pressure drop information along with an analysis of system influences
should be used to estimate actual pressure losses for a damper in a given HVAC system.
The pressure drop is a calculated estimation from AMCA Standard 500 using figure
5.3. For AMCA certified pressure drop ratings on Air Performance see the appropriate
damper model specification sheet for that model.
Important Notes:
- See appropriate damper model specification sheet for minimum and maximum assembly
and section sizes.
Maximum assembly size 3 x 1 assembly
Minimum assembly size 8” x 8”
- Standard damper assemblies are furnished ¼” smaller. Pressure drop
and free area may vary.
- All calculations are with external mounted actuators and accessories.
- Maximum velocity for V-Groove blade 2000 FPM and Airfoil blades 3000 FPM. (Dampers
with V-Groove blades are structurally designed for velocities to 2000 FPM and above.
Turbulence may produce objectionable noise in some conditions with velocities above
1500 FPM)
Directions:
- Enter the number of dampers then select "Next"
- Enter the Width, Height, and Flow Rate for each damper.
- Select "Next"
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