3.5.1.1 Important considerations when removing an existing boiler:
When an existing boiler is removed from a common venting system, the common venting system is
likely to be too large for proper venting of the appliances that remain connected to it. When resizing any
portion of the common venting system, use the minimum size according to the appropriate tables in the
National Fuel Gas Code, ANSI Z223.1 - latest edition. In Canada, use the B149.1 Installation Code.
At the time of removal of an existing boiler the following steps shall be followed with each appliance
remaining connected to the common venting system placed in operation, while the other appliances
remaining connected to the common venting system are not in operation:
Seal any unused opening in the common venting system.
Visually inspect the venting system for proper size and horizontal pitch. Determine that there is
no blockage or restriction, leakage, corrosion and other deficiencies that could cause an unsafe
condition.
(Where practical) Close all building doors and windows such as doors adjacent to appliances
remaining connected to the common venting system and other spaces of the building.
Turn on clothes dryers and any appliance not connected to the common venting system.
Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will
operate at maximum speed. Do not operate a summer exhaust fan.
Close fireplace dampers.
Place in operation the appliance being inspected.
Follow the lighting instructions.
Adjust the thermostat so that the appliance operates continuously.
After determining that each appliance remaining connected to the common venting system
properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace
dampers and any other gas-burning appliance to their previous condition.
Any improper operation of the common venting system should be corrected, so the installation
conforms with the National Fuel Gas Code, ANSI Z223.1 - latest edition. In Canada, all
installations must conform with the current CAN/CGA - B149.1-10 Installation Code and/or local
codes.
Warning
Covering non-metallic vent pipe and fittings with thermal insulation is prohibited.
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