Auto-Zone Plus
Section 1
Design Guide
1-15
Step #6 - Sizing the Zone Damper
Use a load program to determine the peak load for each zone. These calculations will be
used in selecting the appropriate zone damper sizes.
Using the maximum acceptable velocity for a branch duct (typically 1000-1500 FPM for
minimal noise), find the smallest damper that will deliver the required CFM as
determined by the load program.
Locate the branch velocity used in the duct design program on the left hand column of
the damper sizing chart (Table 1-1). Move across the chart and find the damper which
will provide the acceptable CFM to meet zone requirements.
Note:
Compare the damper size selected against the duct size to determine if the
next size up or down will provide acceptable performance without requiring a
transition fitting.
One additional damper may be slaved together for large zones. See zone wiring diagram
for details. This should be reserved for situations when it is not practical to use a single
large damper.
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