Duct Pieces
x
Number used
=
Equivalent Length
Rectangular-to-Round
Tran-
5 ft (1.5 m)
sition Adaptor*
X
Wall Cap
40 ft (12.2 m)
x
90 ° Elbow
10 ft (3 m)
x
45 ° Elbow
5 ft (1.5 m)
x
90 ° Elbow
25 ft (7.6 m)
x
45 ° Elbow
5 ft (1.5 m)
x
Roof Cap
24 ft (7.3 m)
x
Straight Duct 6" (152 mm
Round or 3 1/4"x
10"
1 ft (0.3 m)
(82 x 254 mm) Rectangular
X
Total Ductwork
=
* If a rectangular-to-round
transition adapter is used, first
make sure the damper hinge of the microwave swings
freely. If necessary, cut the damper to fit, using the tin
snips, in order to allow free movement.
Equivalent lengths of duct pieces are based on actual
tests and reflect requirements
for good venting
performance
with any vent hood.
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