Installation Guide
21 Page
Installaon
Installaon Manual
CENTROTHERM PP VENTING (Polypropylene)
WARNING! Do not mix parts or fittings of different material types, and do not mix pipe, fittings, or 
joining methods from different manufacturers. Combustion exhaust can contain carbon monoxide and 
must be properly vented outside. Breathing abnormal amounts of carbon monoxide can result in seri-
ous injury or death.
Description
Centrotherm Part Number (Trade 
Name InnoFlue)
4''/6'' (102 mm/152 mm) x 39" (990 mm) Concentric Wall
ICWS4639 
4'' (102 mm) Twin Pipe to 4''/6'' (102 mm/152 mm) Concentric Adaptor
ICTC0446
4" (102 mm) x 87° Elbow 
ISEL0487
100 mm to 4" (102 mm) Increaser 
ISIA10004 
4" (102 mm) x 12" (305 mm) Vent Length 
ISVL041
4" (102 mm) x 24" (610 mm) Vent Length 
ISVL042
4'' (102 mm) x 36'' (914 mm) Vent Length 
ISVL043
4" (102 mm)x 72" (1,829 mm) Vent Length 
ISVL046
4" (102 mm) Horizontal Drain Tee 
ISHDT04
3''/5'' (76 mm/127 mm) x 13'' (330 mm) Concentric Wall Termination SS
ICWS3513 
3'' (76 mm) Twin Pipe to 3''/5'' (76 mm/127 mm) Concentric Adaptor
ICTC0335 
3" (76 mm) x 87 Elbow 
ISEL0387
3" (76 mm) x 12" (305 mm) Vent Length 
ISVL031 
3" (76 mm) x 24" (610 mm) Vent Length 
ISVL032 
3" (76 mm) x 36'' (914 mm) Vent Length 
ISVL033
3" (76 mm) x 72'' (1,829 mm) Vent Length 
ISVL036
100 mm to 4" (102 mm) 110 mm
ISRA1003
3" (76 mm) Horizontal Drain Tee 
ISHDT03 
1.  Connect a 3" (76 mm) elbow directly on the 
intake vent collar of the water heater.
2.  Connect a 3" (76 mm) coupling directly on the 
exhaust vent collar of the water heater.
3.  Connect a 3" (76 mm) straight pipe to the
coupling.
1.  Connect a 3" (76 mm) elbow directly on the 
intake vent collar of the water heater.
2.  Connect a 3" x 4" (76 x 102 mm) increaser 
directly on the exhaust vent collar of the 
water heater.
3.  Connect a 4" (102 mm) straight pipe to the 
increaser.
Exhaust vent
collar
(Female)
3" (76 mm) elbow 
with bird screen
Intake vent collar
(Female)
4" (102 mm)
straight pipe
3"x 4"
(76 x 102 mm)
increaser
Exhaust vent
collar
(Female)
Intake vent collar
(Female)
3"(76 mm)
straight pipe
3" (76 mm) coupling 
(included)
3" (76 mm) elbow 
with bird screen










