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Figures
3 through
6 are examples
of possible
ducting
Remote
Blower
Roof Mount
Installation
] hrough
wall installation
Remote
Blower
Fig. 3
Blower
Integral
Blower
] hrough
Wall Installation
12" Min.
Ground
Fig. 4
Integral
Blower
] hrough
Wall Installation
,CONNECTION
Fig. 5
Ir/line Blower
] hrough Wall Installations
Wall
Cap___
i
12" Min.
1__
Ground
Duct
/ I
'Transition
Box
ii,I
]lnline
Blower
Fig. 6
DUCTWORK
INSTALLATION
GUIDE-
ucting should vent directly outdoors
(not into an attic, underneath
the house,
into the garage or into any enclosed
space). A Recirculation
Module is availa-
ble when ducting
to the outside is not
ossible.
eep duct runs as short and straight as
ossible.
uct fittings (elbows and transitions)
educe air flow efficiency.
ack to back elbows and "S" turns give
very poor delivery and are not recom-
mended.
_A
short straight length of duct at the inlet
of the remote blower gives the best deli-
Or very'
ansition to duct from the integral blo-
wer or remote duct transition
as close to
the downdrafl
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
Ohe
use of flexible metal round duct
should only be used when no other duct
fitting exists. Limit use to short lengths
_h
d do not crush when making corners.
ck to back elbows should be avoided.
ere 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
o eliminate
future rusting.
se only duct work constructed
of mate-
rials that are acceptable
by the applica-
ble codes. All duct should be 26 gauge
or heavier to minimize flex due to air
flow.
Ohe
remote blowers require a 10" or 6"
diameter round duct (depending
on
model) to match the inlet ring. A transiti-
n is necessary from other duct sizes.
se sheet metal screws as required to
support the duct weight, and seal all
ints with duct tape.
e certain that the duct work does not
interfere with floor joists or wall studs.
Qo
not exhaust more than one vent into
single duct run.
old weather installations
should have
an additional
backdrafl
damper installed
to minimize
backward
cold air flow and a
nonmetallic
thermal break to minimize
conduction
of outside temperatures
as
part of the ductwork,
The damper
should be on the cold air side of the
thermal
break.
The break should be as
close as possible to where the ducting
enters the heated portion of the house,
Iways use an appropriate
roof or wall-
cap with damper. Laundry type wall caps
should never be used.
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