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* 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.
Duct Pieces x Number used = Equivalent Length
Rectangular-to-Round Tran-
sition Adaptor*
5 ft (1.5 m) 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"
(82 x 254 mm) Rectangular
1 ft (0.3 m) x =
Total Ductwork =
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