Venting design specifications – KITCHENAID 30 Inch Over-The-Range Microwave Installation Instructions User Manual

Page 12

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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 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 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 Vent Length

A 3¹⁄

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.

3¹⁄

4

" x 10" (8.3 x 25.4 cm) vent system = 73 ft (22.2 m) total

.

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. 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

A B

C

6 ft (1.8 m)

2 ft

(0.6 m)

A. One 3¹⁄

4

" 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)

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