3
Wall Construction
Your Over-the-Range microwave oven should be mounted against and supported by a flat, vertical wall. Wall construction should be
a minimum of 2” x 4” wall studding and 3/8” or more, thick drywall or plaster/lath. The oven must be attached to a minimum of one
2” x 4” wall stud.
For proper installation the wall must be capable of supporting the cabinet load plus a minimum of 135 pounds, (the 85 pound weight
of the microwave oven and load weight allowance of 50 pounds.) To find studs, use one of the following methods:
Outside ventilation requires HOOD
EXHAUST DUCT. Read the following
carefully.
EXHAUST CONNECTION: The hood
exhaust has been designed to mate with a
standard 3-1/4” x 10” rectangular duct.
If round duct is required, a rectangular-to-
round transition adapter must be used. Do not
use less than a 6” diameter duct.
REAR EXHAUST: If rear or horizontal
exhaust is to be used, care should be taken to
align exhaust with space between studs, or wall
should be prepared at the time it is constructed
by leaving enough space between wall studs to
accommodate exhaust.
MAXIMUM DUCT LENGTH: For
satisfactory air movement, the total duct length
of 3-1/4” x 10” rectangular or 6” diameter
round duct should not exceed 140 feet of
equivalent duct run.
ELBOWS, TRANSITIONS, WALL AND
ROOF CAPS, etc.,
present additional resistance to air flow and are
equivalent to a section of straight duct which is
longer than their actual physical size. When
calculating the total duct length add the
equivalent lengths of all transitions and
adaptors plus the lengths of all straight duct
sections. The diagram below shows the
approximate feet of equivalent length of some
typical ducts.
Hood Exhaust Duct
3/8” Drywall or
Plaster / Lath
Usually 16" or 24"
2” X 4”
wood stud or
metal stud
(25 gauge or thicker)
Lag screws must be installed
in these area
I. Stud finder-a magnetic device which locates nails.
II.Using a hammer, tap lightly across the mounting surface
to find a solid sound. This will indicate a stud
installation. After locating the stud(s), the center can be
found by: Probing the wall with a small nail to find the
edges of the stud and then placing a mark half way
between the edges. The center of any adjacent studs
should be 16” or 24” from this mark.
III. Draw a line down the center of the studs.
Roof Cap (24Ft)
90˚ Elbow (10Ft)
45˚ Elbow (5Ft)
Rectangular-to-Round
Transition Adaptor (5Ft)
Wall Cap (40Ft)
90˚ Elbow (25Ft)
