DC Inverter U-match Series Duct Type Unit
26
(3) If the bottom return air is desired, just change the place of the rectangular
flange and the return air cover plate.
(4) Connect one end of the return air duct to the return air outlet of the unit by
rivets and the other to the return air louver. For the sake of the convenience
to freely adjust the height, a cutting of canvas duct will be helpful, which can
be reinforced and folded by 8# iron wire.
(5) More noise is likely to be produced in the bottom return air mode than the
backward return air mode, so it is suggested to install a silencer and a static
pressure box to minimize the noise.
(6) The installation method can be chosen with considering the conditions of
the building and maintenance etc, as shown in Fig. 4.36.
Fig. 4.36
Table 4.7 Installation of the return air duct
No.
Name
No.
Name
1
Return Air Inlet (with filter)
4
Indoor unit
2
Canvas Duct
5
Supply Air Duct
3
Return Air Duct
6
Grille
