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33
APPENDIX B – VENTING
VENT THIS BOILER according to the instructions. Failure to do so may cause products of
combustion to enter the building resulting in severe property damage, personal injury or death.
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Install this boiler according to this manual and the National Fuel Gas Code, ANSI Z223.1/NFPA 54,
the Natural Gas and Propane Installation Code, CAN/CSA B149.1, or applicable provisions of the
local building codes. Contact local building or fire officials about restrictions and installation
inspection in your area.
If you are removing an existing boiler from a gas
vent or chimney that is also used to vent other gas
appliances:
1. Seal any unused openings in the
common venting system.
2. Visually inspect the venting system
for proper size and horizontal pitch
and determine there is no blockage or
restriction, leakage, corrosion, and other
deciencies which could cause an
unsafe condition.
3. Resize the common venting system
to approach the minimum size as
determined using the National Fuel Gas
Code, ANSI Z223.1 and/or CAN/CSA
B149.1, Installation Codes.
4. Check the draft of each remaining
appliance using the procedure described
in Appendix G, checking draft and
combustion.
5. Correct any draft problems before
placing the gas appliances back into
service.
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In addition to previously mentioned vent
codes of the main general guidelines,
atmospheric vented installations must
also be in accordance with the Standard for
Chimneys, Fireplaces, Vents and Solid Fuel
Burning Appliances, ANSI/NFPA 211. For Canada
installations, refer to the Natural Gas and LP
Installation Code, CAN/CSA- B149.1.