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20
Rectangular-to-Round Transition
NOTE: The minimum 3" (76 mm) clearance must exist between
the top of the microwave oven and the rectangular-to-round
transition piece so that the damper can open freely and fully.
A
B
C
E
F
G
D
A. Roof cap
B. 6" (152 mm) minimum diameter round vent
C. Elbow (for wall venting only)
D. Wall cap
E. 3
1
/
4
" x 10" to 6" (83 x 254 mm to 152 mm) rectangular-
to-round transition piece
F. Vent extension piece, at least 3" (76 mm) high
G. 3" (7.6 cm)
Recommended Standard Fittings
The following length equivalents are for use when figuring vent
length. See the examples in “Recommended Vent Length.”
A B C
D E F G
A. Rectangular-to-round transition piece: 3
1
/
4
" x 10" to 6" = 5 ft (83 x
254 mm to 152 mm = 1.5 m)
B. Roof cap: 3
1
/
4
" x 10" = 24 ft (83 x 254 mm = 7.3 m)
C. 90° elbow: 3
1
/
4
" x 10" = 25 ft (83 x 254 mm = 7.6 m)
D. 90° elbow: 6" = 10 ft (152 mm = 3 m)
E. Wall cap: 3
1
/
4
" x 10" = 40 ft (83 x 254 mm = 12.2 m)
F. 45° elbow: 6" = 5 ft (152 mm = 1.5 m)
G. 90° flat elbow: 3
1
/
4
" x 10" = 10 ft (83 x 254 mm = 3 m)
Recommended Vent Length
A 3
1
/
4
" x 10" (83 x 254 mm) rectangular or 6" (152 mm) round vent
should be used.
The total length of the vent system including straight vent, elbow
(s), transitions and wall or roof caps must not exceed the
equivalent of 140 ft (42.7 m) for either type of vent. See the
“Recommended Standard Fittings” section for equivalent lengths.
For best performance, use no more than three 90° elbows.
To calculate the length of the system you need, add the equivalent
lengths of each vent piece used in the system. See the following
examples:
3
1
/
4
" x 10" (83 x 254 mm) vent system = 73 ft (22.2 m) total
A B
C
D
E
A. One 3
1
/
4
" x 10" (83 x 254 mm) 90° elbow= 25 ft (7.6 m)
B. 1 wall cap = 40 ft (12.2 m)
C. 2 ft (0.6 m) + 6 ft (1.8 m) straight = 8 ft (2.4 m)
D. 6 ft (1.8 m)
E. 2 ft (0.6 m)
6" (152 mm) vent system = 73 ft (22.2 m) total
A
B
C D
E
F
A. Two 90° elbows = 20 ft (6.1 m)
B. 1 wall cap = 40 ft (12.2 m)
C. 1 rectangular-to-round transition piece = 5 ft (1.5 m)
D. 2 ft (0.6 m) + 6 ft (1.8 m) straight = 8 ft (2.4 m)
E. 6 ft (1.8 m)
F. 2 ft (0.6 m)
If the existing vent is round, a rectangular to round transition piece
must be used. In addition, a rectangular 3" (7.6 cm) extension
vent between the damper assembly and rectangular to round
transition piece must be installed to keep the damper from
sticking.
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