DC Inverter U-match Series Duct Type Unit   
40 
3.2.7.3 Installation of Supply Air Duct and Return Air Duct 
Installation method shall be selected by entirely considering the conditions of 
buildings, maintenance, etc.as is shown in the following figure. 
 
Name  canvas duct  return air duct  supply air duct  indoor unit 
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. 
 
(2)   Install the round flange so that it can be connected to the fresh air duct, as 
is shown in the following figure. 
 
(3)   The air duct and round flange duct shall be concealed and kept warm 
well. 
(4)   The fresh air is the air after filtration.