22
ZONE DAMPERS
Zonex Systems zone dampers are
used in cooling/heating systems to
provide room by room zone
control. The damper is provided
with a factory mounted actuator.
Each zone damper is controlled
by a zone thermostat. More than
one damper can be controlled by
one zone thermostat. Use this
table to determine which zone
dampers to use.
ROUND MEDIUM PRESSURE ZONE DAMPERS
Zonex Systems round medium pressure zone dampers are
recommended for systems with a maximum differential static
pressure up to 1.75”. This modulating power open/power close
damper is manufactured from 20-22 gauge galvanized steel with
rolled-in stiffening beads for superior rigidity. Mechanical minimum
and maximum set stops are provided and are easily adjustable. The
damper is elliptical, which allows the airflow to be tracked linearly.
The damper pipe is furnished with one crimped end and one straight
end for easy installation. Do not install damper in an inverted
position. A hat section supports a reversing 24vac, 60Hz, 2 VA
motor. A magnetic clutch allows for continuous power to the motor
and longer motor life. Motor drive time from full open to full close is
90 seconds.
ROUND MEDIUM PRESSURE DAMPER
PART NUMBERS AND SIZES
TYPICAL ROUND CAPACITIES
These air quantities were derived from a duct sizing
chart 0.1” friction loss per 100’ of duct. All CFMs
listed are approximate. For accurate selection, use
duct sizing table or device.
DAMPER MODEL
MAXIMUM
DIFFERENTIAL
PRESSURE
MAXIMUM
SYSTEM SIZE
MAXIMUM
DUCT SIZE
STMPD
Round Med. Pressure
1.75”
Any Size
18”
STMRTD
Rect. Med. Pressure
1”
7.5 Tons
24”W x 20”H
STCD
Rect. Heavy Duty
1.75”
Any Size
48”W x 48”H
D-FUSER
0.1”
Any Size
10”
Maximum Differential Pressure refers to the maximum static pressure drop in inches
of water column between the input (upstream) of the zone damper and the output
(downstream) when the damper is closed.
DUCT
DIAMETER
NOMINAL
CFM
DUCT VELOCITY
FPM
DAMPER
∆P “ WC
6”
110
540
.014
8”
250
700
.015
10”
410
750
.015
12”
660
850
.022
14”
1000
925
.035
16”
1450
1070
.036
18”
2000
1100
.036
L
W
D
R O U N D DI M E NS I O N AL D AT A
PART #
SIZE
D
L
W
STMPD06
6
6”
10”
9”
STMPD08
8
8”
10”
11”
STMPD10
10
10”
12”
13”
STMPD12
12
12”
14”
15”
STMPD14
14
14”
16”
17”
STMPD16
16
16”
18”
19”
STMPD18
18
18”
20”
21”
MEDIUM PRESSURE (STMPD)
DAMPER TO
MODSTAT
WIRING
MODSTAT
