350
7. Connection of return air duct (setting back air return opening when leaving factory)
Remarks:
In installation, you can select the lower air return or back air return by adjusting the location of air inlet frame.
8. Concatenation means of exchanging esh air
(1) Cut away the nummular component of
lateral board
(2) Install the nummular air pipe (air pipe can be
purchased in local district )
(3) Airproof the joint by airproof cingulum avoiding
B
C
C
N
B
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