30
4.2.6. With Down Flow Return Fan
ROOF CONNECTOR WITH DOWN OUTPUT AND AXIAL RETURN FAN
55
70
90
110
140
180
230
A
1619
1619
1834
1834
1988
1988
2179
B
1366
1366
1748
1748
2358
2358
3081
C
402
402
415
415
640
640
889
D
964
964
1333
1333
1718
1718
2192
E
710
710
710
710
710
710
710
F
800
800
800
800
800
800
800
S1
675
675
675
675
675
675
675
S2
810
810
917
917
995
955
1090
①
Duct connection space of blow air
②
Duct connection space of absorption air
③
Partition metal sheet of absorption and blow
air
④
Balance connection extension
⑤
Exhaust gravity damper
⑥
Access panel of return fans
⑦
Axial return fans