Filter
Top Products
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.