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VENTING REQUIREMENTS (cont.)
Rectangular to Round Transition
NOTE:
The minimum 3" (7.6 cm) 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. Roof cap
B. 6" (15.2 cm) min. diameter round vent
C. Elbow (for wall venting only)
D. Wall cap
E. 3
¹⁄₄
" x 10" to 6" (8.3 x 25.4 cm to 15.2 cm)
rectangular to round transition piece
F. Vent extension piece, at least 3" (7.6 cm) high
A
B
C
E
F
D
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. Rectangular to round transition piece: 3
¹⁄₄
" x 10" to 6" = 5 ft
(8.3 x 25.4 cm to 15.2 cm = 1.5 m)
B. Roof cap: 3
¹⁄₄
" x 10" = 24 ft (8.3 x 25.4 cm = 7.3 m)
C. 90° elbow: 3
" x 10" = 25 ft (8.3 x 25.4 cm = 7.6 m)
D. 90° elbow: 6" = 10 ft (15.2 cm = 3 m)
E. Wall cap: 3
¹⁄₄
" x 10" = 40 ft (8.3 x 25.4 cm = 12.2 m)
F. 45° elbow: 6" = 5 ft (15.2 cm = 1.5 m)
G. 90° flat elbow: 3
¹⁄₄
" x 10" = 10 ft (8.3 x 25.4 cm = 3 m)
A B C
D E F G
Recommended Vent Length
A 3¹⁄₄" x 10" (8.3 x 25.4 cm) rectangular or 6" (15.2 cm) 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 “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:
3¹⁄₄" x 10" (8.3 x 25.4 cm) vent system = 73 ft (22.2 m) total
A. One 3
¹⁄₄
" x 10" (8.3 x 25.4 cm) 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) strai
g
ht = 8 ft (2.4 m)
A B
C
6 ft (1.8 m)
2 ft
(0.6 m)
6" (15.2 cm) vent system = 73 ft (22.2 m) total
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)
A B
C D
6 ft (1.8 m)
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.
Because Whirlpool Corporation policy includes a continuous commitment to improve
our products, we reserve the right to change materials and specifications without notice.
Dimensions are for planning purposes only. For complete details, see Installation
Instructions packed with product. Specifications subject to change without notice.
Ref. W10724866A
12/12/14
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