Multi Variable Air Conditioners Duct Type Indoor Unit
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4.4 Installation of Air Duct
NOTICE:
① There should be insulation layer on air-out duct, air-return duct and fresh air duct to avoid
heat loss and moisture. Adhere a nail on the air duct and then add thermal sponge with a
layer of tin. Fasten it with a nail cover and then seal the junction with tin tapes; you can also
use other materials that have good insulation quality.
② Each air-out duct and air-return duct should be fixed on a pre-made board with iron frame.
The junction of air duct should be well-sealed in order to prevent air leakage.
③ The design and construction of air duct should comply with national requirements.
④ The edge of air-return duct is suggested to be more than 150mm away from the wall. Add a
filter to the air-return opening.
⑤ Please consider noise-damping and vibration damping for the design and construction of air
duct. Besides, noise source must be away from people. For instance, do not have the air-
return opening installed on top of the user (offices, rest area, etc.).
4.4.1 Installation of Air-out Duct
(1) Installation of Rectangular Duct
Fig 4.20
(2) Installation of Circular Duct
Fig 4.21
No. Name No. Name
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