Frigidaire FMV145KB2 Installation Instructions Manual page 5

Installation Instructions
NOTE: If you need to install ducts, note that the total
duct length of 3 V/' x 10" rectangular or 6" diameter round
duct should not exceed 140 equivalent feet (42.67 m).
Outside ventilation requires a HOOD EXHAUST
DU(T. Read the follo_dng carefiflly.
NOTE: It is important that venting be installed using
the most direct route and with as tew elbows as possible.
This ensures cleat 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 3V/' 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 satisLt{ to D air movement, the total du{t length of
3]/, " x 10" rectangular or 6" diameter round duct should
not exceed 140 equivalent feet (42.67 m).
Elbows, transitions, wall and roof caps,
etc.,
present additional resistance to airflow and are
equiwtlent 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 duclwork length using the
approximate teet of equivalent length of some typical
ducts.
EQUIVALENT NUMBER EQUIVALENT
DUCT PIECES LENGTH x USED = LENGTH
Rectangular-to-Round 5 Ft. x ( } = Ft.
TransitionAdaptor* (1,52m) (m)
Wall Cap 40 Ft. x ( ) = Ft.
(12.19m) (m)
()_ go °Elbow 10 Ft. x ( ) = Ft.
(3,05m) (m)
{_ 45° Elbow 5 Ft, x ( ) = Ft.
(1,52m) (m)
go ° Elbow 25 Ft. x ( ) = Ft.
(7,62m) {m)
45° Elbow 5 Ft. Ft.
( )
X
(1£2 m} (m)
Roof 24 Ft. ( } Ft.
Cap
×
(7,32m} (m)
StraightDuct6" Roundor 1 Ft. x ( ) = Ft.
374"x 10" Rectangular (30,48cm} (cm)
Total Ductwork = Ft. {m}
* IMPORTANT: lla I('LlalI_ulaI-I(}-F(}uI3d tlansiti(}n E( uivalent 1€nNhs of dtlcl Die (:€s arc bas((l ()ll a(:tua[ tcsIs
adaplor is used, th( botlom Comers of the dam )(r and r_ flecI te( uirements lbr good vc n/ing peHbnnance with
willhaveIobe cut to
ill, using
the tinsnips,in
or(let al]x
vent hood.
to all{*_ free naoxement o f tla_
damper.
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