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The wall housing is designed to reduce installation time and provide maximum installation flexibility.
Attached accessories such as backdraft dampers, guards and weatherhoods may mount to either end. As a
result a wide variety of configurations are available to accommodate the needs of the system designer.
The following information will help determine the correct arrangement required. When ordering specify
arrangement by the drawing number 1A, 2A, 1B or 2B as shown in the diagrams below.
NOTE: Weatherhoods are strongly recommended for all configurations to help prevent moisture infiltration.
Mounting flange, damper and guard ship factory mounted on all arrangements as shown except when
ordered as a kit.
Mounting Arrangements for Interior Service Applications
Pressure Loss
CFM x 1000
EXHAUST FAN in Wall Housing with Gravity
Damper and Weatherhood
SUPPLY FAN in Wall Housing with Gravity
Damper and Weatherhood
Airflow
Airflow
Static Pressure
Pressure Loss
CFM x 1000
Static Pressure
Wall
Wall
Supply
Exhaust
Interior
Exterior
Supply
Exhaust
Wall
Wall
Interior
Exterior
Flush exterior
Flush interior
1A-R Supply
2A-R Supply
1B-R Exhaust 2B-R Exhaust
Wall Housing Mounting Arrangements
Interior
Exterior
Supply
Exhaust
Wall
Wall
Supply
Exhaust
Wall
Wall
Interior
Exterior
1B Supply
1A Exhaust
2B Supply
2A Exhaust
Flush exterior
Flush interior
Reverse mounting a wall housing simply involves
installing the wall housing through the wall
opening in the opposite direction of the above
configurations. This results in an opposite effect
on fan function. An exhaust fan in a wall housing
will function as a supply fan when the housing is
reverse mounted.
Example: When the exhaust arrangement shown as
1A is reversed (shown as 1A-R) the same unit now
becomes a supply arrangement. The construction,
fan position and mounting angle location in both
configurations remain identical.
The arrangements shown below are the most
commonly used and should be considered first
for most applications. The choice of flush interior
or exterior mounting are based on appearance or
space considerations.
Belts, pulleys and motors are serviced from
inside the building with these arrangements. For
applications requiring service from outside the
building, see reverse mounting arrangements below.
Mounting Arrangements for Exterior Service Applications (Optional)