8.1 Connections And Termination
Boilers for connection to gas vents or chimneys, vent
installations shall be in accordance with "Venting of
Equipment" of the National Fuel Gas Code, ANSI Z223.1/
NFPA 54, or "Venting Systems and Air Supply for
Appliances", of the Natural Gas and Propane Installation
Code, CAN/CSA B149.1, or applicable provisions of local
building codes.
Provisions for combustion and ventilation air must be
in accordance with section, Air For Combustion and
Ventilation, of the National Fuel Gas Code, ANSI 2223.1/
NFPA54, National Gas and Propane Installation Code, CAN/
CGA-B 149.1, in absence of such requirements to the
Authority having jurisdiction.
Boilers require dedicated direct vent system. All air for
combustion is taken directly from outdoors through
combustion air intake pipe. All f]ue products are discharged
to outdoors through vent pipe.
1. See Figures 5 and 6 for two pipe combustion air
and vent pipe roof and sidewall termination. Roof
termination is preferred. Combustion air and vent pipes
must terminate together in same atmospheric pressure
zone as shown.
2. Use of concentric vent termination see Figures 7-9for
proper setup.
3. For Canadian installations all plastic venting material
must be listed to ULC $636.
4. Construction through which vent and air intake pipes
may be installed is maximum 24 inches, minimum 1/4"
thickness.
5. See Table 5 for combustion air and vent pipe fittings
approved material and standards.
6. Canada construct all combustion air and vent pipes
for this unit of ULC $636 listed schedule-40 CPVC,
schedule-40 PVC, PVC-DWV or ABS-DWV pipe and pipe
cement. SDR pipe is not approved in Canada.
• First 3 feet (900ram) of venting must be readily
available for visual inspection.
• Specified primers and glues of certified vent
system must be from single manufacturer, and not
intermixed with other manufacturer's vent system
parts.
• Components of the certified system must not be
interchanged with other vent systems, or unlisted pipe
and/or fittings.
ASTM F 891 *
ASTM D2665 **
PVC ASTM D1785 **
ASTM D2241 **
ASTM D2846 **
CPVC ASTM F441 **
ASTM F442 **
ASTM D2661 ***
ABS ASTM F628 ***
* Allowable temperatures based on Classifications covered in ASTM
D4396 [Deflection Temperatures under Load (264psi) (1819 KPa)].
** Allowable temperatures based on Classifications covered in ASTM
D1784 [Deflection Temperatures under Load (264psi) (1819 KPa)].
*** Allowable temperatures based on Classifications covered in ASTM
D3965 [Deflection Temperatures under Load (264psi) (1819 KPa)].
Length of pipe is counted from end of supplied 2" CPVC
pipe exiting boiler. Termination is not counted in "Total
Lent h.
PVCschedule 40 ANSI/ASTM D1785
PVC- DWV ANSI/ASTM D2665
CPVCschedule 40 ANSI/ASTMD1784/F441
Vent Pipe
and Fittings SDR-21 & SDR-26 PVC ANSI/ASTM D2241
ABS-DWV ANSI/ASTM D2661
Schedule 40ABS ANSI/ASTM F628
PVC ANSI/ASTM D2564
Pipe
Cement/ CPVC ANSI/ASTM F493
Primer Schedule 40 ABS ANSI/ASTM D2235
• IPEX is approved vent manufacturer in Canada listed
to ULC-$636.
• IPEX System 636 Cements and Primers are approved
in Canada listed to ULC-$636.
Transition from 2" pipe to 3" pipe must be made in
vertical run.
7. Boiler combustion air and vent pipe connections are 2"
but must increase to 3". Due to potential for flue gas
temperatures above 155°F, first 30" of supplied vent
pipe is CPVCwhile remaining vent pipe can be PVC. Any
replacement of first 30" of vent pipe must be made with
CPVC.
8. Covering non-metallic vent pipe and fittings with thermal
insulation shall be prohibited.
Length of pipe is counted from end of supplied 2" CPVC
pipe exiting boiler. Termination is not counted in "Total
Equivalent Length."
Reduce maximum vent/air intake length by 5 feet per each
90° elbow.
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