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
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
.
2
3. From the outside, use the guide hole as a starting point
to lay out the installation:
A. Use a T-square to measure 9
13
/
16
" 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 rectan-
gular cutout (18" 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 11
13
/
16
" 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 rectangular
cutout (22" 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.
7"
2"
2 9
½
"
22"
2 "
