Airflow
Airflow
Hangers by
others
Airflow
Airflow
Supply
Fan
Exhaust
Fan
Guarding is strongly
recommended
D
Supply
Fan
Guard or
Diffuser
Wall
Housing
A
C
A
9
Standard Mounting Options
Motor on Top
Air Blowing
Upward
Motor on Top
Air Blowing
Downward
Horizontally mounted fans are available for applications
requiring vertical airflow.
Typical applications include mounting fans in ductwork
or plenums as transfer fans or suspending them from
the ceiling in a wall housing for use as recirculation
fans. Both belt and direct drive fans can be horizontally
mounted. Motors can be mounted on top or on bottom
with airflow up or down. Specify configuration best
suited for access and service.
Horizontally mounted fans are put under different
stresses than fans mounted in a wall. Construction
modifications are required depending on motor
location (top or bottom) and whether the fan is belt
or direct drive.
The split drawing (right) illustrates the typical ways
of mounting fans directly to the wall
when a wall housing or collar is not used.
For exhaust fans, there is a minimum dimension
(M) which must be maintained between the
propeller and damper, or guard to achieve
optimum performance (failure to meet this minimum
dimension will result in loss of fan performance,
increased noise and shortened fan and damper
life). There is also a minimum required wall opening
dimension (W.O.) to allow the venturi to fit into the
wall opening.
The chart at far right provides the minimum “M”
and wall opening dimensions.
This installation may require a spacer (by others)
between the fan and wall to achieve the minimum “M” dimension.
Fans can be mounted directly to a wall only if the wall is of
sufficient thickness to meet the minimum “M” dimension as
shown here. If mounting to a wall through the face of the fan
panel, holes will need to be appropriately drilled where required.
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).
M
Wall Opening
Standard Wall Mounting
Standard Horizontal Mounting
Airflow
Airflow
Hangers by
others
Exhaust
Fan
B
Guarding is strongly
recommended
D
Supply
Fan
Guard or
Wall
Housing
A
Motor on Bottom
Air Blowing Upward
(Shown as suspended
installation with fan
mounted in wall
housing.)
Motor on Bottom
Air Blowing
Downward
(Shown as
suspended
installation with fan
mounted in wall
housing.)
Modifications Shown in Diagrams
A Grooved shaft with snap rings (belt drive fans)
B
Motor pulley retaining hardware (belt drive fans
with motor on bottom)
C
Reinforcing angles on fan panel (all fans with
motor on bottom)
D
Propeller retaining hardware - not shown (direct
drive fans with motor on top)
NOTE: Protective guarding is also required below the fan for safety. When
guarding is not ordered with the fan, it must be supplied by the installer.
When specifying a fan for horizontal mounting, the motor location (top or
bottom) and airflow (upward or downward) are required information.
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