Baxi LUNA HT 1.450 Installation And Servicing Instructions page 24

All vent pipe and combustion air pipe and fittings must comply with the following:
ABS schedule 40
PVC schedule 40
CPVC schedule 40
Materials used in the U.S. must comply with the following relevant standards: ANSI/ASTM D1785, ANSI/ASTMD2661,
ANSI/ASTMF441.
Note:
In Canada, ULC S636 approved schedule 40 CPVC is the only approved vent system approved to be used as an alter-
native to Baxi venting for the exhaust pipe.
WARNING for USA ONLY
DO NOT USE CELLULAR CORE PIPE
ONLY 3" PIPES ARE PERMITTED
When using venting material other than the boiler's manufacturer's venting, note the correct installation procedure:
A total of 39 in (1 meter) of straight exhaust vent must be used before transition to ABS/PVC vent material.
First 1.0 meter / 3.28 ft. of vent use
polypropylene pipe (*)
HT Boiler
3.93 in / 100.0 mm
Fig. 16
(*) accessories supplied by the boiler's manufacturer
INSTALLATION AND SERVICING INSTRUCTIONS
polypropylene to ABS coupling (*)
3" two pipe vent system
2.36 in / 60.0 mm
24
Through the wall 1.64 ft (50.0 cm)
polypropylene vent (*)
Polypropylene to ABS couplings (*)
a b
a = 2.36 in 60.0 mm
b = 7.87 in / 200.0 mm
Vent
terminals (*)
min. 8 in /
203.0 mm
7110242.02 - en