ACME 924738, Installation & Maintenance Instructions Manual, Page: 3 / 18

Page 3
WALL OPENING REQUIREMENTS
MOUNTING OPTIONS
NOTE: Fans mounted inside a wall require a different wall opening
size than fans that are mounted directly to the wall, this also applies
to the wall box (WBP) and wall collar (WCP) options. Determine which
installation method is needed based on model of the fan and images
below. Provide a square opening in the wall based on the recommend
wall opening (W.O.) for the fan model purchased. It is preferable to
frame in the opening with 2 x 6 material, or similar suitable material or
metal channels adequate for support of the fan. The installer provides
suitable fasteners (hex bolts or lag screws) to secure the fan. After
determining installation type and opening needed refer back to instal-
lation section.
Highly Recommended: Weather Hood (WHP) is recommended
to reduce water from getting into the fan. If a weather hood (WHP)
is not used the fan housing should be sloped to allow for drainage.
Additional caulking on the inside of the wall box may be necessary. Do
not cover holes along the outside bottom edges.
INSIDE WALL MOUNT
(Noted on Submittal Drawings Rough Opening)
(Exhaust or Supply (-R) Fans)
Illustrated below is a typical installation when mounting the fan inside
a wall opening. Flashing over opening and brackets for mounting fan
and or damper by others. Propeller-to-damper distance (M) is import-
ant to reduce turbulence and damper flutter which may lead to prema-
ture damper failure. See Figure 2 & 3 and Table 1 for correct distances.
It is preferable to frame in the opening with 2 x 6 material, or similar
suitable material or metal channels adequate for support of the fan.
The installer provides suitable fasteners (hex bolts or lag screws) to
secure the fan. Dampers are designed to reduce drafts, prevent entry
of foreign material and limit the amount of rain that enters the building.
The dampers are weather-resistant only they are not weatherproof.
NOTE: Not all sizes in chart are available in all fan models.
WALL MOUNTED (FACE MOUNT)
(Exhaust or Supply (-R) Fans)
Illustrated is a typical installation when mounting the fan directly to the
wall. Flashing over damper by others. Propeller-to-damper distance
(M) is important to reduce turbulence and damper flutter which may lead
to premature damper failure. See Figure 4 & 5 and Table 2 for correct
distances. It is preferable to frame in the opening with 2 x 6 material, or
similar suitable material or metal channels adequate for support of the
fan. The installer provides suitable fasteners (hex bolts or lag screws)
to secure the fan. Dampers are designed to reduce drafts, prevent entry
of foreign material and limit the amount of rain that enters the building.
The dampers are weather-resistant only they are not weather-proof.
NOTE: Not all sizes in chart are available in all fan models.
FIGURE 3
M
(W.O.)
FLASHING BY OTHERS
AIRFLOW
A B
MOTORIZING KIT (OPTIONAL)
AIRFLOW
MOTORIZING KIT (OPTIONAL)
(W.O.)
A
M
FLASHING BY OTHERS
B
FAN
SIZE
A
SQUARE
B
DAMPER
SQUARE
RECOMMENDED
WALL OPENING
(W.O.) SQUARE
M
MIN.
IN.
9 14.00 14.00 11.75 6.50
10 14.00 14.00 11.75 6.50
12 18.00 18.00 15.75 7.50
14 18.00 18.00 15.75 8.50
16 23.00 23.00 20.75 9.50
18 23.00 23.00 20.75 10.50
21 26.50 26.00 23.75 12.00
24 30.00 30.00 27.75 12.50
30 37.50 37.00 34.75 13.50
36 45.00 45.00 42.75 14.50
42 60.00 60.00 57.75 15.50
48 64.00 64.00 57.75 16.50
M
(W.O.)
FLASHING BY OTHERS
AIRFLOW
A B
MOTORIZING KIT (OPTIONAL)
AIRFLOW
MOTORIZING KIT (OPTIONAL)
(W.O.)
A
M
FLASHING BY OTHERS
B
EXHAUST
SUPPLY
EXHAUST
SUPPLY
FAN
SIZE
A
SQUARE
B
DAMPER
SQUARE
RECOMMENDED
WALL OPENING
(W.O.) SQUARE
M
MIN.
IN.
9 14.00 14.00 14.50 6.50
10 14.00 14.00 14.50 6.50
12 18.00 18.00 18.50 7.50
14 18.00 18.00 18.50 8.50
16 23.00 23.00 23.50 9.50
18 23.00 23.00 23.50 10.50
21 26.50 26.00 27.00 12.00
24 30.00 30.00 30.50 12.50
30 37.50 37.00 38.25 13.50
36 45.00 45.00 45.75 14.50
42 60.00 60.00 61.00 15.50
48 64.00 64.00 65.00 16.50
FIGURE 2
FIGURE 4
FIGURE 5
TABLE 1
TABLE 2