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7
1.7 Cu. Ft. Over-the-Range Microwave
Exhaust requirements
Use this section if you plan to vent your microwave outside (top or back exhaust). If you plan to recirculate the air back into
the room, skip to Unpacking your microwave
on page 9.
When installing exhaust vents:
• Use the most direct route with as few elbows/transitions as possible. This helps prevent blockages and ensures that the
exhaust is being vented correctly. Also make sure that dampers swing freely and that nothing is blocking the ducts.
• Your microwave is designed to mate with a standard 3 1/4” × 10” (8.2 x 25.4 cm) rectangular duct or 5 in. (12.7 cm)
diameter/6 in. (15.2 cm) diameter round duct. If a round duct is required, a rectangular-to-round transition adapter
must be used.
• Elbows, transitions, and wall/roof caps add resistance to airflow. Each of these pieces are equivalent to a section of
straight duct that is longer than their actual physical size. When calculating your duct length, add the equivalent
lengths of all the pieces together. For proper airflow, the equivalent airflow should not exceed 140 ft. (42.7 m).
For example:
Note: If a rectangular-to-round transition adapter is used, you must cut the bottom corners of the damper with tin snips to let the
damper have free movement.
Important: If a rectangular-to-round transition adapter is used, the bottom corners of the damper will have to be cut to fit, using the
tin snips, in order to allow free movement of the damper.
Note: For back exhausting, care should be taken to align exhaust with space between studs, or the wall should be prepared at the
time it is constructed by leaving enough space between the wall studs to accommodate exhaust.
E
X
A
M
P
L
E
Duct Pieces Equivalent
Length
× Number
Used
=Total
Equivalent
Length
24 ft.
(7.3 m)
×
(
1 )
=
24 ft.
5 ft.
(1.5 m)
×
(
1 )
=
5 ft.
12 ft.
(3.6 m)
×
( 1 )
=
12 ft.
Total ductwork =
41 ft.
Roof cap
Rectangular-to-
Round Transition
Adapter
12 ft. (3.6 m) Straight
Duct (6 in. (15.2 cm)
round
Equivalent lengths of duct pieces are based on actual tests and reflect requirements for
good venting performance with any vent hood.
For proper airflow,
this number should
not exceed 140 ft.
Outside top
exhaust
(example)
(7.3 m)
(1.5 m)
(3.6 m)
(12.5 m)
E
X
A
M
P
L
E
Duct Pieces Equivalent
Length
× Number
Used
=Total
Equivalent
Length
40 ft.
(12.2 m)
×
( 1 )
=
40 ft.
10 ft.
(3 m)
×
( 2 )
=
20 ft.
3 ft.
(.9 m)
×
( 1 )
=
3 ft.
Total ductwork =
63 ft.
Wall cap
90° elbow
Straight duct 6” round
OR
3-1/4” × 10” rectangular
Outside back
exhaust
(example)
For proper airflow,
this number should
not exceed 140 ft.
Equivalent lengths of duct pieces are based on actual tests and reflect requirements for
good venting performance with any vent hood.
(12.2 m)
(6 m)
(.9 m)
(19.2 m)
Use the Equivalent duct length table on page 8 to calculate the equivalent ductwork length for your setup.
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