(3) Connect the return duct to the return air inlet of indoor unit with rivet, and the
other side shall be connected to the return air inlet. For the convenience of free
height adjustment, canvas duct can be made and reinforced with iron wire to a
folding shape.
(4) The noise of downward return air is obvious bigger than that of rear return air.
For downward return air, silencer and static pressure carton shall be added to
conduct noise reduction treatment.
3.2.7.3 Installation of Air Supply Duct and Air Return Supply
Installation method shall be selected by entirely considering the conditions of
buildings, maintenance, etc., as is shown in the following figure.
3.2.7.4 Installation of Fresh Air Duct
(1) While connecting the fresh air duct, cut off the fresh air baffle plate as is shown
in the following figure. If the fresh air duct is not used, block the gap of fresh air
baffle plate with sponge.
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