Dimensions Guide

Because Whirlpool Corporation 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.
Page 2 of 3
Ref. W11084412A
05/31/2017
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.
Roof venting Roof cap
Wall venting
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
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. 3¹⁄₄" 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
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: 3¹⁄₄" x 10" to 6" = 5 ft
(8.3 x 25.4 cm to 15.2 cm = 1.5 m)
B. Roof cap: 3¹⁄₄" x 10" = 24 ft (8.3 x 25.4 cm = 7.3 m)
C. 90° elbow: 3¹⁄₄" 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: 3¹⁄₄" 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: 3¹⁄₄" x 10" = 10 ft (8.3 x 25.4 cm = 3 m)