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24
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 backdraft 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 are 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.
A
B
C
D
A. Roof venting
B. Roof cap
C. Wall venting
D. Wall cap
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
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" (8.3 x 25.4 cm to 15.2 cm) a
rectangular-to-round transition piece
F. Vent extension piece, at least 3" (7.6 cm) 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
(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)
Recommended Vent Length
A 3
1
/
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 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:
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