Prepare The Installation Location - Broan 331H Installation Manual

PREPARE THE INSTALLATION
LOCATION
.
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.). Bear in mind, 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.
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From inside the attic space:
2. Drill a PILOT HOLE up through the roof, 81/2"
from the inside edge of a ROOF RAFTER.
From outside - on the roof:
3. Measure and mark the 203A" x 201/2" rectangle.
Cut and remove only the shingles inside this
rectangle.
4. Measure and mark the 11" DIAMETER HOLE
and the 11A" DIAMETER HOLE. Cut these holes
all the way through the roof.
Figure 2
.
For flat roof installations, build a curb that will
mount the blower at a minimum pitch of 2/12. See
Figure 2. Discharge end of the blower should be
pointed away from prevailing winds.
PREPARE THE INSTALLATION 2
LOCATION
1. Choose a position on the outside wall. Make sure
that no wall studs, pipes or wires run through the
opening area.
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From inside the wall:
2. Drill a PILOT HOLE through the wall, 81/2" from
the inside edge of a WALL STUD.
From outside - on the wall:
3. Measure and mark the 25" x 291/2" rectangle. Cut
and remove only the siding inside this rectangle.
4. Measure and mark the 11" DIAMETER HOLE
and the 11A'' DIAMETER HOLE. Cut these holes
all the way through the wall.
PREPARE THE BLOWER
1. Unpack the blower assembly.
2. Remove the cover and screws.
3. Remove and discard cardboard from blowerwheel.
4. Remove the wiring box cover and screws.
5. Attach an appropriate CSA approved cable con-
nector in the hole at the rear of the wiring box.