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4
INSTALLATION
Planning Your Fan Location
As with any exhaust system, your exhaust fan should be located a minimum of 6 feet horizontally and 8
feet vertically from any fresh air intakes to prevent re-entrainment of exhaust air streams. For example
HVAC systems, heat recovery systems, and windows would all be considered fresh air intakes.
When planning your fan placement keep in mind that you will need to be able to run your duct work from
the exterior fan to the bathroom inlet.
Considering access for the duct run before hand will make installation easier.
Installating Exterior Wall Fan
1. Once you have chosen the location where you
wish to mount the fan, cut a 4 3 / 8 " diameter
hole in the exterior of the wall. Prepare a piece of
rigid duct (purchase separately) approximately 2"
longer than the wall thickness. This will be used
as a collar extension placed through the wall.
2. Take off the fan discharge cover by removing
the four screws. Center the fan in the hole that
was cut into the wall. Mark the locations of the
mounting holes and electrical knockout. Drill a
hole for the electrical that is 1 / 8 " larger than the
conduit being used. A 1" electrical service opening
is provided on the fan backplate .
NOTE: When mounting the fan to a masonry wall,
drill 7 / 32 " holes for the four anchors and
mounting screws (provided). Anchors should be
flush with the edge of the holes. For mounting to
wood surfaces use wood screws (purchased
separately).
Flexible Duct Installation Hints
Fantech strongly recommends the use of flexible insulated duct where ducting passes through uncondi-
tioned space or where noise is a factor. Check local code requirements before installing. Failure to use
insulated flexible duct could result in excessive condensation buildup within the duct, and undesirable
sound levels within the room.
A minimum of 8' of insulated flexible duct is recommended between the fan and any inlet grille. Duct
should be stretched as tight and straight as possible. Failure to do so could result in dramatic loss of
system performance. Connect flex duct to the fan with plastic zip ties or duct tape. Connections should
be airtight as possible for maximize performance.
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3. Bring your electrical supply through the wall.
Attach the fan collar to the extension collar using
duct tape. Be sure this connection is as airtight
as possible to prevent leakage. Apply polyurethane
caulk to the exterior of fan housing backplate,
leaving bottom uncaulked for drainage. This will
ensure an airtight/waterproof connection between
the fan and wall.
NOTE: If installing on lapped siding it may be
necessary to use a mounting frame made from
1x1 board to insure a flush fit.
4. Mount the fan to the wall. Replace the
discharge cover. Connect your ducting to the
extension collar using plastic ties or duct tape
(purchased separately).
FINAL INSTALLATION NOTE: If fan location is not
protected by an eve, a standard flashing should
be installed. Seal against the wall and upper
edge of the fan discharge cover to prevent rain
water from entering fan housing.
Fantech recommends insulated flexible duct for all
bathroom exhaust applications.
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