Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
22
Ductwork Configuration
WARNING
When an air duct which carries supply air or warm air passes
through a combustible roof, a clearance of one inch must be
maintained between the outside perimeter of ductwork and any
combustible materials, per NFPA Standard 90A
When the supply air discharge opening and/or the return
air intake opening are located on the bottom of a unit, the
ductwork must be connected to the curb directly. The
actual opening sizes in the floor of the unit are not
specified as they are slightly undersized from the duct
dimensions shown on the following curb drawings.
The contractor is responsible for providing transitions to
accommodate difference in sizing between the unit and
the building ducts. Duct connections to collar-type
openings can be made with S-cleats or overlapping joints.
Apply caulk around each duct connection. Failure to seal
duct connections can cause air leakage and system
performance problems.
A straight duct for a distance of three (3) to six (6) duct
diameters from the unit discharge should be used to
develop a full dynamic head.
Branching and turning closer to the discharge causes
system effect losses
Exhaust Air Hood Assembly
Each unit comes with a factory-supplied air exhaust hood
that must be assembled prior to startup.
Figure 6: Exhaust Air Hood Assembly
Item #
Description
(EA)
1
HOOD TOP
1
2
HOOD SIDE-A
1
3
HOOD SIDE-B
1
4
GRILLE
1
The outdoor air hood parts are
located at the bottom of the unit.
1. Remove and discard the shipping foam or tape.
2. Remove and take inventory of parts shipped in the
sill of the opening.
3. Install the Left and Right side triangle support with
Top cover and Grille
4. Align the pre-punched holes in the Hood Top piece
with the Triangle side supports. Secure in place
with the provided
5/16” hex-head screws
