Hood Exhaust ........................................... 4 - Maytag MMV4205BAQ - 2.0 cu. Ft. Microwave Installation Instructions Manual

Installation instructions
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Installation
Instructions
NOTE: If you need to install ducts, note that the total
duct length of 3¼" x 10" rectangular
or 6" diameter
round duct should
not exceed 60 equivalent
feet.
Outside
ventilation
requires
a HOOD EXHAUST
DUCT. Read the following
carefully.
NOTE:
It is important
that venting be installed
using
the most direct route and with as few elbows as
possible.
This ensures
clear venting
of exhaust
and
helps prevent blockages.
Also, make sure dampers
swing
freely
and nothing
is blocking
the ducts.
Exhaust
connection:
The hood exhaust
has been designed
to mate with a
standard
3¼"x
10" rectangular
duct.
If a round duct is required,
a rectangular-to-round
transition
adaptor
must be used. Do not use less
than a 6" diameter
duct.
Maximum
duct length:
For satisfactory
air movement,
the total duct length of
3¼" x 10" rectangular
or 6" diameter
round duct
should
not exceed
60 equivalent
feet.
Elbows,
transitions,
wall and roof
caps,
etc.,
present
additional
resistance
to
airflow 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 length
of all straight
duct sections.
The chart below shows
you how to calculate
total equivalent
ductwork
length
using the approximate
feet of equivalent
length of
some typical
ducts.
DUCT PIECES
EQUIVALENT
NUMBER
EQUIVALENT
LENGTH
x
USED
=
LENGTH
Rectangular-to-Round
Transition
Adaptor*
5 Ft.
x
(
=
Ft.
Wall Cap
40 Ft.
x
(
=
Ft.
(_
90 ° Elbow
10 Ft.
x
(
=
Ft.
(_
45 ° Elbow
5 Ft.
x
(
=
Ft.
90 ° Elbow
25 Ft.
x
(
=
Ft.
45 ° Elbow
5 Ft.
x
(
=
Ft.
Roof Cap
24 Ft.
x
(
=
Ft.
-1
Straight
Duct 6" Round or
3¼" x 10" Rectangular
1 Ft.
x
(
=
Ft.
Total Ductwork
=
Ft.
* IMPORTANT:
If a rectangular-to-
round transition
adaptor
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.
Equivalent
lengths of duct pieces are based on actual
tests and reflect requirements
for good venting
performance
with any vent hood.
5

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