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Backdraft Dampers
Used alone or in conjunction with the wall housing or wall collar, backdraft dampers are available for exhaust or supply
configurations. Backdraft dampers are constructed with galvanized frames, aluminum blades and vinyl blade seals.
Actuators are available in 24, 120, 208, 230 or 460 volts. Actuators for 50 cycle voltages are also available. Actuators for
50 cycle voltages are also available.
Volume Control/Heavy Duty Dampers
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.
¹
Model WD-320 and WD-300 are used with fans where the motor is 5 hp or less. For fans with motors larger than 5 hp, the Model GM-31 medium duty gravity backdraft damper or
the Model VCD heavy duty motorized backdraft dampers are required.
²
Model WD-430 and WD-420 are used with fans where the motor is 5 hp or less. For fans with motors larger than 5 hp, the Model VCD heavy duty motorized backdraft dampers are
required.
³
Model WD-220 and WD-210 are used with fans where the motor is 3 hp or less. For fans with motors larger than 3 hp, the Model VCD heavy duty motorized backdraft damper is
required.
Note: Wall housing length increases by 6 inches (152 mm) when a heavy duty backdraft damper is specified.
Wall Housing Installation Wall Installation
Airflow
Airflow
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
Damper Type Description Flush Exterior Flush Interior
Exhaust - Gravity or Motorized
¹
WD-320 and WD-300
exhaust dampers are
available as either gravity
operated or motorized
Exhaust backdraft dampers
are Model WD-320, which
has the prepunched
mounting flange located
on the outlet end of the
damper for a flush exterior
appearance.
For applications where the
mounting flange is required
on the inlet end of the
damper (so that the damper
projects to the exterior), the
Model WD-300 is available.
Model WD-320 shown
Supply – Gravity
²
• WD-430 and WD-420
intake dampers are
only available as gravity
operated
• Galvanized steel frame
and aluminum blades
• Model WD-430 has a
prepunched mounting
flange located on the inlet
end of the damper for a
flush exterior appearance
• Flange on intake
• Model WD-420 is for
applications where a
prepunched mounting
flange is required on the
outlet end of damper (so
the damper projects to
the exterior)
• Flange on discharge
Model WD-430 shown
Supply - Motorized
³
• WD-220 and WD-210
intake dampers are only
available as motorized
• Galvanized steel frame
and aluminum blades
• Model WD-220 has a
prepunched mounting
flange located on the inlet
end of the damper for a
flush exterior appearance
• Flange located opposite
of motor side of the
damper
• Model WD-210 is for
applications where
a mounting flange is
required on the outlet end
of the damper (so that
the damper projects to
the exterior)
• Flange located on motor
side of the damper
Model WD-220 shown
Airflow Airflow
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Wall InstallationWall Housing Installation
Wall InstallationWall Housing Installation
Wall InstallationWall Housing Installation