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Venting
requirements
Ductwork
needed for installation
is not
supplied.
Wall cap is provided
with interior
mounted
motor.
Fire Hazard
Venting
system
MUST terminate
to the
outside.
Do Not terminate
the ductwork
in an attic or
other enclosed
space.
Do Not use 4-inch laundry-type
wall caps.
Do Not use plastic-type
ductwork.
Use only metal ductwork.
Failure to follow
these instructions
can
result in a fire.
To reduce risk of fire and to properly
exhaust
air, be sure to duct air outside.
Do Not vent exhaust
air into spaces within
walls or ceilings
or into attics, crawl spaces
or garages.
Determine which venting method to use.
Ductwork can extend either through the wall or
roof.
The length of the ductwork and number of elbows
should be kept to a minimum to provide efficient
performance.
The size of the ductwork should be
uniform. Do Not install two elbows together. Use
duct tape to seal all joints in the duct system.
Use caulking to seal exterior wall or floor opening
around cap.
Flexible
metal ductwork
is Not recommended.
If it is used, calculate each foot of flexible metal
ductwork as two feet of straight metal ductwork.
Flexible metal elbows count twice as much as
standard elbows. Use metal ductwork only.
Figures 3-7 show common venting methods and
types of materials needed. If the ductwork cutout
location falls over a joist or stud, a supporting
frame must be constructed.
Do not cut joist or
stud.
NOTE:
Make sure there is proper clearance
within the wall or floor for exhaust duct before
making cutouts.
Interior
mounted
vent motor
installation
methods
To install ductwork
under a concrete
slab,
see Insert Sheet.
Island location
8,
II
Figure 3
Interior
wall location
Figure 4
Recommended
duct length for interior
mounted
blower
Use 6" duct with maximum length of 25 feet for
duct system. For best performance,
use no more
than three 90" elbows. To calculate the length of
system you need, add the equivalent
feet for
each duct piece used in the system. See the
following example:
6" duct system
90" elbows
--6fi.
LI
wall cap
Maximum length
= 25 ft
2 - 90 elbows
= loft.
1 - wall cap
= Oft.
8 feet straight
= 8ft.
Length of 6" system
= 18 ft.
Recommended
standard
fittings
90" elbow = 5 ft.
1 90" elbow = 9 ft.
6" to 3-l 14"
xlO"=lft.
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