Submittal Sheet

Table Of Contents
The RD-HD Series of round Hand Dampers are
designed for field adjustment of Differential
Pressure and Velocity Control on Round Bypass
Air Duct Runs.
Pursuant to ACCA® Manual Zr, “A balancing hand
damper should be installed in the bypass duct” for
setting adequate resistance to bypass flow.
The RD-HD includes a Heavy Duty Manual
Quadrant allowing Easy & Accurate Field
Adjustment of the Pressure Drop through the
Bypass duct run.
In addition, the RD-HD has a truncated blade
design resulting in 70% maximum closure. This
superior design ensures minimum bypass flow
even if the hand damper is accidentally closed all
the way.
The RD-HD is designed to provide reliable and
quiet Balancing Function at velocities up to 2700
feet per minute.
RD-HD dampers are easy to install and adjust. The
superior design insures long life with no
maintenance and a 5 year warranty.
See Application Note #090376A0169 for
installation and setup instructions.
SUBMITTAL SHEET
Forced Air Zone Controls
®
Model RD-HD Round
Volume Control Bypass Hand Damper
385 Hwy. 33
Englishtown, NJ 07726
Ph: 800-446-3110
Fx: 732-446-5362
SUBMITTAL FORM
SUBMITTED BY:
JOB:
ARCHITECT:
ENGINEER:
CONTRACTOR:
LOCATION:
P/N 090377A0163 REV. H 04.08.14
Copyright © 2011 EWC Controls Inc., All Rights Reserved.
CONTROLS INC.
Excellence Without Compromise
E
W
C
MODEL #MODEL #
A A
B B
NOMINAL DIMENSIONS & PERFORMANCE VALUES
8.00” 8.00”
14.00”14.00”
RD-HD - 14 RD-HD - 14
10.00”10.00”
16.00”16.00”
RD-HD - 16 RD-HD - 16
10.00”10.00”
18.00”18.00”
RD-HD - 18 RD-HD - 18
10.00”10.00”
20.00”20.00”
RD-HD - 20 RD-HD - 20
CFM @
900 FPM
940
1250
1560
1900
6.00” 6.00”
8.00” 8.00”
RD-HD - 8 RD-HD - 8
6.00” 6.00”
10.00”10.00”
RD-HD - 10 RD-HD - 10
8.00” 8.00”
12.00”12.00”
RD-HD - 12 RD-HD - 12
700
480
310
Press.
Drop IWC
0.02
0.02
0.02
0.02
0.02
0.02
0.02
Pressure Drop values may increase at higher velocities
Manual
Quadrant
Range of
Adjustment
B
A

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