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DUCTWORK INSTALLATION
GUIDELINES
❑ For safety reasons, ducting should vent
directly outdoors (not into an attic,
underneath the house, into the garage or
into any enclosed space).
❑ Keep duct runs as short and straight as
possible.
❑ Duct fittings (elbows and transitions)
reduce air flow efficiency.
❑ Back to back elbows and ”S” turns give
very poor delivery and are not
recommended.
❑ A short straight length of duct at the inlet
of the remote blower gives the best
delivery.
❑ Transition to duct from the integral blo-
wer or remote duct transition as close to
the downdraft as is possible. In order of
preference, use
1st. 10” round duct
2nd. 8” round duct
3rd. 3-1/4” x 14” duct
4th. 7” round duct
5th. 3-1/4” x 10” duct
6th. 6” round duct
❑ The use of flexible metal round duct
should only be used when no other duct
fitting exists. Limit use to short lengths
and do not crush when making corners.
DUCTWORK INSTALLATION
GUIDELINES
❑ Where local codes permit, plastic pipe
(PVC-schedule 40 pipe or ABS pipe 7”
or 8” diameter) can be used in areas of
high ground moisture and in slab floors
to eliminate future rusting.
❑ Use only duct work constructed of
materials that are acceptable by the
applicable codes. All duct should be
26 gauge or heavier to minimize flex due
to air flow.
❑ The remote blowers requires a 10” or 8”
diameter round duct (depending on
model) to match the inlet ring. A
transition is necessyary from other duct
sizes.
❑ Use sheet metal screws as required to
support the duct weight, and seal all
joints with duct tape.
❑ Be certain that the duct work does not
interfere with floor joists or wall studs.
❑ Do not exhaust more than one vent into
a single duct run.
❑ Thermal breaks, such as a short section
of nonmetallic duct, should be used in
areas of extreme cold.
❑ Always use an appropriate roof or
wall-cap with damper. Laundry type wall
caps should never be used.