Page 114 - 2018_IFGC

CHIMNEYS AND VENTS

installed to bypass such valve. Dampers shall not be
installed in the exhaust system.
Exception: An interlock between the cooking appli-
ance(s) and the exhaust hood system shall not be
required where heat sensors or other approved methods
automatically activate the exhaust hood system when
cooking operations occur.

SECTION 506 (IFGC)
FACTORY-BUILT CHIMNEYS

506.1 Building heating appliances. Factory-built chimneys
for building heating appliances producing flue gases having a
temperature not greater than 1,000°F (538°C), measured at
the entrance to the chimney, shall be listed and labeled in
accordance with UL 103 and shall be installed and terminated
in accordance with the manufacturer’s instructions.
506.2 Support. Where factory-built chimneys are supported
by structural members, such as joists and rafters, such mem-
bers shall be designed to support the additional load.
506.3 Medium-heat appliances. Factory-built chimneys for
medium-heat appliances producing flue gases having a tem-
perature above 1,000°F (538°C), measured at the entrance to
the chimney, shall be listed and labeled in accordance with
UL 959 and shall be installed and terminated in accordance
with the manufacturer’s instructions.

2018 INTERNATIONAL FUEL GAS CODE ® 101
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