Duct Work - LG ANNQ60GKA4 Installation Manual

INSTALLATION
10

Duct work

- Over 10 screws should be used for joining supply duct with the unit.
- To prevent vibration transmission, exploit flexible connectors between duct and the unit. It is
mandatory that the flexible connector between unit and duct at discharge connection should be
made off heat resistive material when electric heater is installed.
- Duct work must be insulated and covered with vapor barrier when routed through
unconditioned space.
- Internal acoustical insulation lining may necessary for the metal duct system if it do not have
90° elbow and 10 ft. of main duct to first branch takeoff.
- It is advised that a fibrous duct work could be used as a substitute if built and installed in
accordance with the most recent edition of SMACNA construction standard on fibrous glass
ducts.
- Collectively fibrous duct work and acoustical lining shall obey National Fire Protection
Association standards 90A or B as tested by UL standard 181 for class 1 air ducts.
- Seal around the delivery duct subsequent to when the duct is secured so that to facilitate
prevention of air leakage.
More than 10 screws
(M4*25L)