Installation Instructions
4
HOOD EXHAUST
NOTE: Read these next two pages only if you plan to vent your exhaust to the outside. If you plan to
recirculate the air back into the room, proceed to page 6.
OUTSIDE TOP EXHAUST (EXAMPLE ONLY)
The following chart describes an example of one possible ductwork installation.
* IMPORTANT:
If a rectangular-to-round transition adaptor is used, the bottom corners of the damper will have
to be cut to fit, using the tin snips, in order to allow free movement of the damper.
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LENGTH
x
NUMBER
USED
=
EQUIVALENT
LENGTH
Roof Cap
24 Ft.
x (1)
= 24 Ft.
12 Ft. Straight Duct (6"
Round)
12 Ft.
x (1)
= 12 Ft.
Rectangular-to-Round
Transition Adaptor*
5 Ft.
x (1)
= 5 Ft.
Equivalent lengths of duct pieces are based on actual
tests and reflect requirements for good venting
performance with any vent hood.
Total Length = 41 Ft.
OUTSIDE BACK EXHAUST (EXAMPLE ONLY)
The following chart describes an example of one possible ductwork installation.
NOTE:
For back exhaust, care should be taken to align exhaust with space between studs, or wall should be
prepared at the time it is constructed by leaving enough space between the wall studs to accommodate
exhaust.
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LENGTH*
x
NUMBER
USED
=
EQUIVALENT
LENGTH
Roof Cap
40 Ft.
x (1)
= 40 Ft.
3 Ft. Straight Duct
(3¼" x 10"
Rectangular)
3 Ft.
x (1)
= 3 Ft.
90° Elbow
10 Ft.
x (2)
= 20 Ft.
Equivalent lengths of duct pieces are based on actual
tests and reflect requirements for good venting
performance with any vent hood.
Total Length = 63 Ft.
