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PREPARE THE INSTALLATION
LOCATION
ROOF INSTALLATIONS
1. Locate the blower on the rear slope of the roof. Place
it in a location to minimize duct run. The location should
be free of obstacles (T.V. leads, electrical lines, etc.).
If the blower top is level with the roof peak, it will not be
seen from the street. Keep this approximate location in
mind as you work from within the attic.
2. Mark and drill a guide hole centered between roof
rafters.
Ø Ø
Ø
Ø
1¼" dia. hole
1¼" dia. hole
REMOVE SHINGLES
REMOVE SHINGLES
12
12
11
11
/
/
"
"
16
16
Guide hole
Guide hole
(centered
(centered
between rafters)
between rafters)
9
12
11
3. From the outside, use the guide hole as a starting point
to lay out the installation:
A. Use a T-square to measure 12
guide hole, then up 12
corner of the layout.
B. Starting from the top-left corner, mark the rectangular
cutout (21" W x 20½" H) and remove only the
shingles in this area.
C. Mark an 11" diameter hole centered on the guide
hole. Cut this hole through the roof board(s).
D. Mark and cut a 1¼" diameter hole through the roof
board(s) where shown.
29-1/2"
25"
4. For flat roof installations, build a curb that will mount the
blower at a minimum pitch of 2/12. Discharge end of the
blower should be pointed away from prevailing winds.
18"
1"
20½"
20½"
11" dia.
11" dia.
hole
hole
5
/
/
"
"
16
8
18"
21"
5
/
" to the left of the
8
11
/
" to locate the top-left
16
2"
7"
2"
PREPARE THE INSTALLATION
LOCATION
WALL INSTALLATIONS
1. Choose a position on the outside wall. Make sure that no
wall studs, pipes or wires run through the opening area.
2. From inside, mark and drill a guide hole centered
between wall studs.
Ø
Ø
Ø Ø
(centered between studs)
(centered between studs)
14
11
/
"
16
REMOVE
REMOVE
SIDING
SIDING
11
14
3. From the outside, use the guide hole as a starting point
to lay out the installation:
A. Use a T-square to measure 14
guide hole, then up 14
corner of the layout.
B. Starting from the top-left corner, mark the rectan-
gular cutout (25" W x 29½" H) and remove only the
siding in this area.
C. Mark an 11" diameter hole centered on the guide
hole. Cut this hole through the roof board(s).
D. Mark and cut a 1¼" diameter hole through the roof
board(s) where shown.
2
20"
17"
1¼" dia. hole
1¼" dia. hole
Guide hole
Guide hole
11" dia.
11" dia.
hole
hole
13
5
/
/
"
"
16
8
25"
22"
5
/
" to the left of the
8
11
/
" to locate the top-left
16
3"
29½"
29½"
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