External Exhaust Ducting
OUTSIDE TOP EXHAUST (EXAMPLE ONLY)
The following chart describes an example of one possible ductwork installation.
DUCT PIECES
EQUIVALENT
LENGTH
x
NUMBER
USED
=
EQUIVALENT
LENGTH
Roof Cap 24 Ft. (7.3 m) x (1) = 24 Ft. (7.3 m)
12 Ft. (3.6 m)
Straight Duct
(6"/15.2 cm Round)
12 Ft. (3.6 m) x (1) = 12 Ft. (3.6 m)
Rectangular-to-
Round Transition
Adaptor*
5 Ft. (1.5 m) x (1) = 5 Ft. (1.5 m)
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. (12.5 m)
* 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.
OUTSIDE BACK EXHAUST (EXAMPLE ONLY)
The following chart describes an example of one possible ductwork installation.
DUCT PIECES
EQUIVALENT
LENGTH
x
NUMBER
USED
=
EQUIVALENT
LENGTH
Wall Cap 40 Ft. (12.2 m) x (1) = 40 Ft. (12.2 m)
3 Ft. Straight Duct
(3
1
⁄
4
"x 10"/8.2
x 25.4 cm
Rectangular)
3 Ft. (0.9 m) x (1) = 3 Ft. (0.9 m)
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