Installation Manual 11
ENGLISH
Installation
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 mandato-
ry 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 10ft. 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)
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