Installation Guide

12
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  exible 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 ef cient
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 two 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.
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  guring vent
length. See the examples in “Recommended Vent Length.”
Roof venting Roof cap
A
B
C
E
F
D
3" (7.6 cm)
A. Roof cap
B. 6" (15.2 cm) 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)
rectangular-to-round transition piece
F. Vent extension piece, at least 3" (7.6 cm) high
AB C
DE FG
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°  at elbow: 3
1
⁄
4
" x 10" = 10 ft (8.3 x 25.4 cm = 3 m)
Wall venting Wall cap