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Option 2: Sloped roof installation
(For flat roof installations see Option 3)
Choose location on the rear slope of the roof that minimizes vent run. Avoid
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obstacles such as TV leads, electric lines, etc. If the remote blower top is level
with the roof peak, it will not be seen from the street. Remember this location as
you work from the inside of the roof space.
Mark a point half way between the rafters and drill a guide hole at this point.
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From the outside, using the guide hole as a starting point, mark the rectangular
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cut-out as indicated in Fig.19. Remove ONLY the roof shingles in THIS AREA.
Mark an 11" (279 mm) diameter circle around guide hole as indicated in Fig.19.
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Mark the center of the 1 1/4" (32 mm) diameter hole for electrical wiring as
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indicated in Fig.19.
Cut out the roof boards along the 11" (279 mm) diameter circle.
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Drill the 1 1/4" (32 mm) diameter electrical wiring hole.
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Remove the roofing nails from the upper two-thirds of the shingles to allow the
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back flashing sheet on the remote blower housing to fit under them.
Center the remote blower ring in the 11" (279 mm) diameter hole, making sure that the
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1 1/4" (32 mm) diameter electrical wiring hole lines up with the hole in the wiring box.
Attach the remote blower to roof or frame using screws appropriate for your
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installation. All four holes in the back panel must be filled to prevent moisture
that may get inside the remote blower housing from leaking into the home.
Seal all the shingles around the remote blower housing, flashing sheet, and
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mounting screw heads or frame with roofing cement. The top and side flanges
of the back plate may be covered with trim. It is recommended that electrical
connection be made and checked first. Do not block the vent grill opening at the
bottom of the trim. Doing so will decrease blower performance.
Continue to the 'Prepare for electrical connection' section on page 21.
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Option 3: Flat roof installation
Locate the 11" (279 mm) diameter hole between rafters.
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Build a sloping base that will mount the remote blower at a minimum pitch of
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2 1/2" (64 mm) see Fig.20 for an example showing 5" (127 mm) pitch.
Weatherproof the base as required.
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Locate the base so that the remote blower's vent aligns with the 11" (279 mm)
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diameter hole and the blower sits evenly on the base with no gaps. Note: Make
sure that the discharge end of the remote blower faces away from the direction
of prevailing winds.
Use dimensions from Fig.19 to locate the 1 1/4" (32 mm) diameter wiring hole.
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Continue from point 8 from the previous 'sloped roof installation' section.
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20
INSTALLATION INSTRUCTIONS
33 1/4"
(845 mm)
discharge side
of blower
26 3/4"
(679 mm)
2" x 4" (51 mm x 102 mm)
7" (178 mm)
11" (279 mm)
dia. hole
2" (51 mm)
Fig.20
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