2
11" dia.
hole
20½"
11" dia.
hole
1"
Ø
Ø
9
11
/
16
"
20½"
Ø
Ø
18"
12
5
/
8
"
18"
12
11
/
16
"
1¼" dia. hole
1¼" dia. hole
Roof Rafter
Roof Rafter
Roof Rafter
REMOVE SHINGLES
REMOVE SHINGLES
Roof Rafter
Guide hole
(centered
between rafters)
Guide hole
(centered
between rafters)
12
11
/
16
"
21"
11" dia.
hole
22"
Guide hole
(centered between studs)
25"
29½"
29½"
14
11
/
16
"
11
13
/
16
"
14
5
/
8
"
17"
W
all Stud
W
all Stud
11" dia.
hole
20"
1¼" dia. hole
1¼" dia. hole
3"
Ø
Ø
Ø
Ø
REMOVE
SIDING
REMOVE
SIDING
Guide hole
(centered between studs)
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
.
PREPARE THE INSTALLATION
LOCATION
ROOF INSTALLATIONS
25"
2"
7"
29-1/2"
2"
WALL 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
.
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
5
/
8
" to the left of the
guide hole, then up 12
11
/
16
" to locate the top-left
corner of the layout.
B. Starting from the top-left corner, mark the rectangu-
lar 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.
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.
PREPARE THE INSTALLATION
LOCATION
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
5
/
8
" to the left of the
guide hole, then up 14
11
/
16
" to locate the top-left
corner of the layout.
B. Starting from the top-left corner, mark the rectangu-
lar 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.