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Frigidaire MMV150KBA Installation Instructions Manual page 11

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Installation
Instructions
NOTE: If
you
need
to install
ducts,
note
that
the
total
duct
length
of 31/4'' x 10" (8.2
x
25.4 cm)
rectangular
or
6" (15.2 cm)
diameter
round
duct
should
not
exceed
120 equivalent
feet
(36.5
m).
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
31/4'' x 10" (8.2 x 25.4 cm)
rectangular
duct.
If a round
duct is required,
a rectangulat_to-round
transition
adaptor
must
be used.
Do not use less than
a 6" (15.2 cm) diameter
duct.
Maximum
duct length:
For satisfactory
air movement,
the total duct
length
of
31/4" x 10" (8.2 x 25.4 cm)
rectangular
or 6" (15.2 cm)
diameter
round
duct should
not exceed
120 equivalent
feet
(36.5 m).
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
&
i
%
0
Rectangular-to-Round
Transition Adaptor*
Wall Cap
90° Elbow
45° Elbow
90° Elbow
45° Elbow
RoofCap
StraightDuct6" (15,2cm)
Roundor 31/4 ` `x 10"
(8,2x 25,4cm)Rectangular
EQUIVALENT
LENGTH
5 Ft, (1,5m)
40 Ft,(12,2m)
10 Ft,(3 m)
5 Ft, (1,5m)
25 Ft, (7,6m)
5 Ft, (1,5m)
24 Ft,(7,3m)
1 Ft, (0,3m)
NUMBER
x
USED
x
()
x
()
x
()
x
()
x
()
x
()
x
()
x
()
EQUIVALENT
LENGTH
Ft,or m
Ft,or m
Ft,or m
Ft,or m
Ft,or m
Ft,or m
Ft,or m
Ft,or m
m
i
Total Ductwork
=
Ft. or m
* IMPORTANT:
If a rectangular
to round
transition
adaptor
is used,
the bottom
corners
of the damper
will have to be cut to lit, 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.
11

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