Carrier 40VU007-054H-7S-QEE Installation And Owner's Manual page 18

Installation
6. Connection of return air duct (setting back air return opening when leaving factory)
Remarks: During installation, you can select the lower air return or back air return by adjusting the location of air
inlet frame. Air return from bottom will influence the unit noise, so we suggest the use of rear return installation.
rear air return opening
a.Concatenation means of exchanging fresh air
(1) Cut away the nummular component of
lateral board
cut
away
cut
away
F
Size
Model
40VD007-018H-7S-QEE
40VD024-030H-7S-QEE
40VD038-054S-7S-QEE
bottom air return opening
(2) Install the nummular air pipe
(air pipe can be purchased from local shop )
11
F G
(mm) (mm)
660 200
740 200
1280 235
nummular air pipe