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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
1¼" dia. hole
REMOVE SHINGLES
12
/
"
11
16
Guide hole
(centered
between rafters)
12
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
left of the guide hole, then up 12
locate the top-left 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.
4. For flat
r o o f
i n s t a l -
lations,
b u i l d
a c u r b
that will
m o u n t
t
h
e
b l o w e r
at a min-
i m u m
pitch of 2/12. Discharge end of the
blower should be pointed downward.
18"
1"
11" dia.
hole
/
"
5
8
21"
/
5
8
29-1/2"
2"
25"
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
14
/
"
11
16
20½"
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
" to the
/
" to
11
16
B. Starting from the top-left corner,
C. Mark an 11" diameter hole cen-
D. Mark and cut a 1¼" diameter hole
2"
7"
3
20"
1¼" dia. hole
Guide hole
(centered between studs)
11" dia.
REMOVE
hole
SIDING
/
14
"
5
8
25"
the left of the guide hole, then up
14
/
" to locate the top-left corner
11
16
of the layout.
mark the rectangular cutout (25"
W x 29½" H) and remove only the
siding in this area.
tered on the guide hole. Cut this
hole through the roof board(s).
through the roof board(s) where
shown.
3"
29½"
/
" to
5
8
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