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Pre-Installation Checks
• Check chart below for correct wall opening
dimensions.
• Check motor voltage and amperage rating for
compatibility with electrical supply. Supply wiring
must be properly fused and conform to local and
national codes.
• Motor load amperage must be checked and
compared to nameplate rating to avoid serious
damage to motor when speed is increased.
Wall Opening Requirements
Wall opening size and propeller-to-damper distance
are two important dimensions for fan installation.
Figure 1 - Wall Housing Installation
W.O.
Figure 3 - Direct to Wall Installation
Recommended Wall Opening (W.O.)
Damper
Fan
Size
Size
Figures 1
Square
and 2
8
10 (254)
141/4 (362)
10
12 (305)
161/4 (413)
12
14 (356)
191/4 (489)
14
16 (406)
211/4 (540)
16
18 (457)
231/4 (591)
18
20 (508)
251/4 (641)
20
22 (559)
271/4 (692)
24
26 (660)
333/4 (857)
30
32 (813) 393/4 (1010)
36
38 (965) 453/4 (1162)
42
44 (1118) 513/4 (1314) 44½ (1130) 51
48
50 (1270) 573/4 (1467) 50½ (1283) 57
54
56 (1422) 633/4 (1619) 56½ (1435) 63
60
62 (1575) 693/4 (1772) 62½ (1588)
72
74 (1880) 843/4 (2153) 74½ (1892)
All dimensions given in inches (millimeters). Filters are 2 inch (51 mm) nominal thickness. Above filter sizes are actual dimensions.
®
W.O.
W.O.
M
Square
M
Minimum
Figure 3
Figure 4
10½ (267)
-
6 (152)
12½ (318)
-
6 (152)
14½ (368)
7 (178)
-
16½ (419)
-
8 (203)
18½ (470)
-
9 (229)
20½ (521)
-
10 (254)
22½ (572)
-
12 (305)
26½ (673)
33
⁄
(857)
13 (330)
3
4
32½ (826)
39
⁄
(1010)
13 (330)
3
4
38½ (978)
45
⁄
(1162)
14 (356) 44
3
4
⁄
(1314)
15 (381) 50
3
4
⁄
(1467)
16 (406) 56
3
4
⁄
(1619)
17 (432) 62
3
4
-
19 (483)
-
19 (483)
Fans mounted to the wall require a different wall
opening (W.O.) size than those mounted in collars or
wall housings. Propeller-to-damper distance (M) is
important to reduce turbulence and damper flutter
which may lead to premature damper failure.
Figure 1 and 2 show the wall opening (W.O.) required
for installations with either a wall housing or collar.
Figure 3 shows the recommended wall opening
(W.O.) and the minimum distance (M) suggested
between the fan and damper for direct to wall
installations.
Figure 4 shows the dimensions and wall opening
(W.O.) required for installations with a filtered supply
wall housing.
W.O.
W.O.
Figure 2 - Wall Collar Installation
Wall
Filter
Housing
Section
A
C
B
Figure 4 - Filtered Supply Wall Housing Installation
Filtered Supply Wall Housing Only
A
B
-
-
-
-
-
-
-
-
-
-
-
-
-
-
32
⁄
(819)
63 (1600)
1
4
38
⁄
(972)
65 (1651)
1
4
⁄
(1124) 67
⁄
(1708)
281/4 (718)
1
1
4
4
⁄
(1273) 72
⁄
(1851)
1
7
8
8
⁄
(1426) 72
⁄
(1851)
1
7
8
8
⁄
(1584) 79
⁄
(2024) 40
3
11
8
16
-
-
-
-
Sidewall Propeller Fans • Exhaust, Supply and Filtered Supply
W.O.
M
INTERIOR
EXTERIOR
Filters
Filters
Airflow
24 in.
15 in.
Optional
Damper
C
Filter Quantity & Size
-
-
-
-
-
-
-
-
-
-
-
-
-
-
24 (610)
4
23
⁄
x 16
⁄
(591 x 413)
1
1
4
4
26 (660)
4
24
⁄
x 19
⁄
(625 x 489)
5
1
8
4
6
23
⁄
x 22
⁄
(591 x 562)
1
1
4
8
34 (864)
6
24
⁄
x 25
⁄
(613 x 638)
1
1
8
8
34 (864)
12
23
⁄
x 18
⁄
(591 x 476)
1
3
4
4
⁄
(1033) 12
23
⁄
x 20
⁄
(591 x 527)
11
1
3
16
4
4
-
-
-
-
W.O.
M
Optional 90º
Weatherhood
3
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