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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
B
C
3" (7.6 cm)
A. Roof cap
B. 6" (15.2 cm) min. diameter round vent
C. Elbow (for wall venting only)
D. Wall cap
¹⁄₄
E. 3
" 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
Recommended Standard Fittings
The following length equivalents are for use when figuring vent
length. See the examples in "Recommended Vent Length."
A
D
E
A. Rectangular to round transition piece: 3
(8.3 x 25.4 cm to 15.2 cm = 1.5 m)
¹⁄₄
B. Roof cap: 3
" x 10" = 24 ft (8.3 x 25.4 cm = 7.3 m)
¹ ₄
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)
¹⁄₄
E. Wall cap: 3
" 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)
¹⁄₄
G. 90° flat elbow: 3
" x 10" = 10 ft (8.3 x 25.4 cm = 3 m)
Recommended Vent Length
A 3¹⁄₄
x 10
(8.3 x 25.4 cm) rectangular or 6
"
"
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:
D
E
F
B
C
F
G
¹⁄₄
" x 10" to 6" = 5 ft
(15.2 cm) round vent
"
3¹⁄₄" x 10" (8.3 x 25.4 cm) vent system = 73 ft (22.2 m) total
A
6 ft (1.8 m)
2 ft
(0.6 m)
¹⁄₄
A. One 3
" 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) straight = 8 ft (2.4 m)
6" (15.2 cm) vent system = 73 ft (22.2 m) total
A
2 ft
(0.6 m)
C
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)
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.
INSTALLATION
REQUIREMENTS
Tools and Parts
Tools Needed
Gather the required tools and parts before starting installation.
Read and follow the instructions provided with any tools
listed here.
Measuring tape
Pencil
Masking tape or thumbtacks
Scissors
No. 2 Phillips screwdriver
No. 3 Phillips screwdriver for
1/4-20 x 3" round-head bolts
Electric drill
3/16" (5 mm), 3/8" (10 mm)
drill bits
3/4" (19 mm) hole saw
B
C
B
6 ft (1.8 m)
D
Stud finder
7/16" socket wrench
(or box wrench) for 1/4" x 2"
lag screws
1½" (3.8 cm) diam. hole drill
bit for wood or metal
cabinet
Keyhole saw
Caulking gun and
weatherproof caulking
compound
Duct tape
3
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