LG LMHM2017ST Installation Instructions - Page 9

Standard, Fittings, calculate, the equivalent, length of each duct piece used, see

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Standard Fittings NOTE: If the existing duct is round, you must use a rectangular-to-round adapter, with a rectangular 3" extension duct installed between the damper assembly and the adapter to prevent the exhaust damper's sticking. Duct Length The total length of the duct system, including straight duct, elbows, transitions, and wall or roof caps must not exceed the equivalent of 140 feet. For best performance, do not use more than three 90 degree elbows, and keep length as short as possible. Below are the standard fittings and their equivalent length in feet. 1 3 3 1/4" x 10" to 6"=5ft. 3 1/4" x 10" roof cap=24ft. 3 1/4,,x 10,, 90_ elbow=25ft. 7 90°elbow =1 Oft. 3 1/4" x 10" wall cap =40ft. 45°elbow =5ft. Figure 10 31/4"x10" flat elbow = 1Oft. To calculate the equivalent length of each duct piece used, see the examples below. For 3 1/4"x10" SYSTEMS 3 1/4"xl 0" Exam }les For 6"ROUND SYSTEMS 90 ° elbows _ 6ft. wall cap 90 ° elbow _,_'- 6ft._ t. _ wall cap 1-3 1/4" x 10" 90° elbow = 25ft. 1-Wall Cap 8 feet straight duct TOTAL LENGTH = 40 ft. = 8 ft. = 73 ft. transi_ _/ 1-transition 2-90 ° elbows 1-Wall Cap 8 feet straight TOTAL LENGTH = 5 ft. = 20 ft. = 40 ft. = 8 ft. = 73 ft. -9-

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Standard
Fittings
NOTE: If the existing
duct is round, you must use a rectangular-to-round
adapter, with a rectangular
3" extension
duct installed
between the damper
assembly
and the adapter
to prevent the exhaust
damper's
sticking.
Duct
Length
The total length of the duct system,
including straight duct, elbows,
transitions,
and wall or roof caps must
not
exceed
the equivalent
of 140 feet.
For best performance,
do not use more than three 90 degree elbows,
and keep length as short as possible.
Below are the standard
fittings
and their equivalent
length
in feet.
1
3 1/4" x 10"
to 6"=5ft.
3 1/4" x 10" roof
cap=24ft.
3
3 1/4,,x 10,, 90_
elbow=25ft.
90°elbow
=1Oft.
3 1/4" x 10"
wall cap
=40ft.
45°elbow
=5ft.
7
31/4"x10"
flat elbow
=1Oft.
Figure 10
To
calculate
the equivalent
length of each duct piece used, see the examples
below.
For 3 1/4"x10"
SYSTEMS
3 1/4"xl
0"
90 ° elbow
_,_'-
6ft._
_
wall
cap
t.
1-3 1/4" x 10" 90° elbow
=
25ft.
1-Wall Cap
=
40 ft.
8 feet straight
duct
=
8 ft.
TOTAL
LENGTH
=
73 ft.
Exam
}les
For 6"ROUND
SYSTEMS
wall cap
90 ° elbows
_
6ft.
transi_
_/
1-transition
=
5 ft.
2-90 ° elbows
=
20 ft.
1-Wall Cap
=
40 ft.
8 feet straight
=
8 ft.
TOTAL
LENGTH
=
73 ft.
-9-