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11
VENTING DESIGN SPECIFICATIONS
This section is intended for architectural designer
and builder/contractor reference only.
NOTES:
■ Vent materials needed for installation are not provided
with microwave hood combination.
■ We do not recommend using a flexible metal vent.
■ To avoid possible product damage, be sure to vent air
outside, unless using recirculation installation. Do not
vent exhaust air into concealed spaces, such as spaces
within walls or ceilings, attics, crawl spaces or garages.
For optimal venting installation, we recommend:
■ Using roof or wall caps that have back draft dampers.
■ Using a rigid metal vent.
■ Using the most direct route by minimizing the length of the
vent and number of elbows to provide efficient performance.
■ Using uniformly sized vents.
■ Using duct tape to seal all joints in the vent system.
■ Using caulking compound to seal exterior wall or roof
opening around cap.
■ Not installing 2 elbows together for optimal
hood performance.
If venting through the wall, be sure that there is proper
clearance within the wall for the damper to open fully.
If venting through the roof, and rectangular to round
transition is used, be sure there is at least 3" (7.6 cm)
of clearance between the top of the microwave oven
and the transition piece. See “Rectangular to Round
Transition” illustration.
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.
Recommended Standard Fittings
The following length equivalents are for use when figuring vent
length. See the examples in “Recommended Vent Length.”
Roof venting Roof cap
Wall venting Wall cap
A
B
C
E
F
D
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
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
D E F G
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
1
/
4
" 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)
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