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Exhaust requiremen
ts
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 “Removing 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.
• Your microwave is designed to mate with a standard 3-1/4” × 10” rectangular duct. If a
round duct is required, a
rectangular-to-round transition adapter must be used. Do not use a duct with a diameter
less than 6”.
• 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 yo
ur duct length, add the
equivalent lengths of all the pieces together. For proper airflow, the equivalent airflow should not exceed 120 ft.
For example:
Note
If a rectangular-to-round transition adapter is used, you must cut the bottom
corners of the damper wih tin snips to let the damper have free movement.
Note
Equivalent lengths of duct pieces are based on actual tests and reflect
requirements for good venting performance with any vent hood.
Use the “Equivalent duct length table” on page 9 to calculate
the equivalent duct-work length for your setup.
8
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