Fujitsu Airstage J-II Series Design & Technical Manual page 628

„ CENTRAL DRAIN PROCESS
„
When converging multiple drain pipes , install according to the procedure shown below.
z For Compact Cassette type, Circular Flow Cassette type, Cassette type
„
Compact Cassette type
A
Circular Flow Cassette type
Cassette type
z For High static pressure duct type
„
For High static pressure duct type
z For Mini duct type, Slim duct type
„
For Slim duct type
Select converging drain pipes whose diameter is suitable for the operating capacity of the unit.
T-joint converging drain pipes
VP30 (O.D. 1-1/2 [38 mm]) or more
Downward gradient 1/100 to 1/50
- (06 - 64) -
28 in. (700 mm) or less
34 in. (850 mm) or less