19
Dampers
Volume Control / Heavy Duty
Volume control dampers are available for exhaust
or supply configurations and may be used alone or
in conjunction with the wall housing or wall collar.
Constructed with heavy galvanized steel frames and
blades, model VCD dampers are designed to handle
higher air volumes than the standard backdraft
damper. Dampers are available in standard leakage
(VCD-20), low leakage (VCD-23) and insulated low
leakage (VCD-34) configurations. Actuators are
available in 24, 120, 208, 230 or 460 volts. Actuators
for 50 cycle voltages are also available.
Damper Type
Description
Flush Exterior Flush Interior
Exhaust or Supply - Motorized
Model VCD-20
Standard leakage
Model VCD-23
Low leakage
This damper has blade and
jamb seals for minimal leakage
when closed.
Model VCD-34
Insulated low leakage
This damper has blade and
jamb seals for minimal leakage
when closed. Blades are
constructed with 1/2 in.
(13 mm)
polystyrene insulation between
two galvanized steel skins.
The VCD damper has
the parallel blade set-
up and a prepunched
mounting flange that
provides a flush exterior
appearance.
N/A
Wall Housing Installation
Wall Installation
Airflow
Airflow
Airflow
Airflow
Airflow
Airflow
Airflow
Airflow
Airflow
Airflow
VCD-20
Fan
Size
M
Wall
Opening
8
6
(152)
10
1
⁄
2
(267)
10
6
(152)
12
1
⁄
2
(318)
12
7
(178)
14
1
⁄
2
(368)
14
8
(203)
16
1
⁄
2
(419)
16
9
(229)
18
1
⁄
2
(470)
18
10
(254)
20
1
⁄
2
(521)
20
12
(305)
22
1
⁄
2
(572)
24
13
(330)
26
1
⁄
2
(673)
30
13
(330)
32
1
⁄
2
(826)
36
14
(356)
38
1
⁄
2
(978)
42
15
(381)
44
1
⁄
2
(1130)
48
16
(406)
50
1
⁄
2
(1283)
54
17
(432)
57
1
⁄
2
(1435)
60
19
(483)
63
1
⁄
2
(1588)
72
19
(483)
74
1
⁄
2
(1892)
All dimensions given in inches
(mm)
.
wall
spacer
guard
wall
damper
M
W
all Opening
Volume control dampers that are ordered with explosion
proof (EXP) actuators will effect overall length of long
wall housing depending on fan size and actuator;
consult factory.
Airflow
Airflow
Airflow
Airflow
