18
Backdraft Dampers
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.
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.
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
Wall Installation
Airflow
Airflow
Wall InstallationWall Housing Installation
Wall Housing Installation
Airflow
Airflow
Wall Installation
Wall Housing Installation
WD-300
Airflow
Airflow
Airflow
Airflow
Airflow
Airflow
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