Dunkirk DCBF-125 - Approved Venting Materials; Vent Termination

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5.4 Approved Venting Materials
5.5 Vent Termination
• 
coaxial vent kit.
Use horizontal pipe for vent and 90° elbow for combustion air

• Separate vent terminal from air inlet terminal to prevent

at sidewall, air inlet terminal shall be at least 36" or more
away from vent terminal.
• Locate combustion air termination as far as possible from
swimming pool, swimming pool pump house, and other
sources of airborne chlorine.
• 
authority having jurisdiction.
Vent Material Options
125 & 150
1 4" / 2" [100 mm / 50 mm] polypropylene coaxial.
2
3" [80 mm] polypropylene twin pipe.
Shall be polypropylene on BOTH intake and
exhaust.
3
2" [50 mm] polypropylene twin pipe.
Shall be polypropylene on BOTH intake and
exhaust.
4

exhaust vent, shall have rigid 3" [80 mm]
polypropylene on air intake.
5
3" [80 mm] Twin pipe CPVC.
PVC optional on intake ONLY.

shall be from same manufacturer and compatible with the
vent pipe. See list for approved Manufacturers.


• USA - National Fuel Gas Code, ANSI Z223.1/NFPA 54.
1. Venting shall be properly supported.
2. Boiler shall not support any type of vent system.
WARNING
Manufacturer recommends this condensing boiler be
vented with approved polypropylene venting material.
Use only materials listed below for vent pipe, intake

death or serious injury.
!
WARNING

pipes are to be used. When using venting material
other than boiler manufacturer's venting, note the
correct installation procedure. Failure to follow these
instructions could result in death, or serious injury.
!
WARNING
• 
thermal insulation shall be prohibited.
• 
result in death, or serious injury.
• Coaxial venting shall be fastened with screws. Dual

!
3. 
components must conform to ASTM and ANSI standards.
In Canada ULC S636 and in the USA UL 1738 schedule 40
CPVC are the only approved vent system to be used as an
alternative to polypropylene venting for the exhaust pipe.
4. 

polypropylene vent system.
Approved Polypropylene Manufacturers
* Natalini
* DuraVent
®
*Centrotherm
* Z-Flex
®

manufacturers.
5 - COMBUSTION AIR AND VENT PIPING
240012564 REV A, [05/15/2019]