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Part No. RG-0508-001 5 The Braeburn Zoning Reference Guide
Understanding Zoning Duct Systems
When designing and installing zoned ductwork, follow all codes and regulations having
authority over the installation. The following tips should help your zoning installation:
The HVAC system must be sized to provide conditioning for the entire area. •
Whenever possible, do not over or under size the equipment. Better results will
be achieved with capacity control such as equipment staging.
Zone controls are not intended to balance air ow. Using good design practices •
and a properly balanced ow will give the best results.
Areas that have extreme differences in temperature that would require constant •
opposite calls may get better results with additional HVAC equipment. Opposite
mode calls work best with zoning when the calls are transition in nature rather
than constant opposite modes.
When determining duct sizes for zoning, we recommend both the “whole building •
load calculation” as well as a “room-by-room load calculation”.
Once the total CFM of the system has been determined, size the dampers using •
the damper chart below. Consider using at least the design CFM to leave margin
for the maximum CFM when multiple dampers are closed. The total CFM of the
system should be at least the total design CFM of the dampers.
The duct system for each branch should be designed to accommodate the •
maximum design CFM for each damper. Following this guideline will help ensure
that the system is quiet even when only a single zone is receiving air ow.
Damper Sizing Chart
Damper Size Design CFM Maximum CFM
6 Inch 100 200
7 Inch 150 250
8 Inch 200 300
9 Inch 300 450
10 Inch 400 600
12 Inch 600 900
14 Inch 1000 1400
16 Inch 1500 2000
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