4
EQUIVALENT NUMBER
EQUIVALENT
DUCT PIECES
LENGTH
x
USED
=
LENGTH
Roof Cap
24 Ft.
x
(1)
=
24 Ft.
12 Ft. Straight Duct
12 Ft.
x
(1)
=
12 Ft.
(6
″
Round)
Rectangular-to-Round
5 Ft.
x
(1)
=
5 Ft.
Transition Adapter*
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 TOP 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.
*IMPORTANT:
If a rectangular-to-round transition adapter 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.
OUTSIDE BACK EXHAUST (EXAMPLE ONLY)
The following chart describes an example of one possible ductwork installation.
EQUIVALENT NUMBER
EQUIVALENT
DUCT PIECES
LENGTH*
x
USED
=
LENGTH
Wall Cap
40 Ft.
x
(1)
=
40 Ft.
3 Ft. Straight Duct
3 Ft.
x
(1)
=
3 Ft.
(3
1
⁄
4
″
x 10
″
Rectangular)
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.
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.
Installation Instructions
