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Installation (continued)-External Exhaust Ducting
OUTSIDE TOP EXHAUST (EXAMPLE ONLY)
The following chart describes an example of one possible ductwork installation.
Equivalent lengths of duct pieces are based on actual tests
and reflect requirements for good venting performance with
any vent hood.
OUTSIDE BACK EXHAUST (EXAMPLE ONLY)
The following chart describes an example of one possible ductwork installation.
Equivalent lengths of duct pieces are based on actual tests and reflect
requirements for good venting performance with any vent hood.
Duct pieces
Roof Cap
12 ft (3.6 m)
Straight Duct
(6 in./15.2 cm
Round)
Rectangular-to-
Round Transition
Adaptor*
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.
Duct pieces
Wall Cap
3 ft Straight Duct
3 1/4 in. x 10 in./8.2
x 25.4 cm
Rectangular)
90° Elbow
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.
Equivalent
Length
24 ft (7.3 m)
12 ft (3.6 m)
5 ft (1.5 m)
Equivalent
Length
40 ft (12.2 m)
3 ft (0.9 m)
10 ft (3 m)
16
Number
x
=
Used
x
( 1 )
=
x
( 1 )
=
x
( 1 )
=
Total Length
=
Number
x
=
Used
x
( 1 )
=
x
( 1 )
=
x
( 2 )
=
Total Length
=
Equivalent
Length
24 ft (7.3 m)
12 ft (3.6 m)
5 ft (1.5 m)
41 ft ( 12.5 m )
Equivalent
Length
40 ft (12.2 m)
3 ft (0.9 m)
20 ft (3 m)
63 ft ( 19.2 m)
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