Multi Variable Air Conditioners Duct Type Indoor Unit
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5.4 Installation of Air Duct
NOTES!
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.).
5.4.1 Installation of Air-out Duct
(1) Installation of Rectangular Duct
Fig 5.4.1
No. Name No. Name
1 Hanger Rod 5 Static Pressure Box
2 Return Air Duct 6 Filter Screen
3 Canvas Duct 7 Main Supply Air Duct
4 Return Air Inlet 8 Supply Air Outlet
(2) Installation of Circular Duct
Fig 5.4.2
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