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Installation Manual 13
Installation
ENGLISH
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.
• To prevent the formation of condensation, insulate the duct well.
• 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 90 A 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*25 L)
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