Specifications

17
The International Fuel Gas Code is also virtually
identical to NFPA 54 when it comes to the venting
termination:
The International Fuel Gas Code is also virtually
identical to NFPA 54 when it comes to venting
appliances:
503.6.4 Gas vent terminations. A gas vent shall
terminate in accordance with one of the following:
1. Gas vents that are 12 inches (305 mm) or less
in size and located not less than 8 feet
(2438 mm) from a vertical wall or similar
obstruction shall terminate above the roof in
accordance with Figure 503.6.4.
2. Gas vents that are over 12 inches (305 mm) in size
or are located less than 8 feet (2438 mm) from a
vertical wall or similar obstruction shall terminate not
less than 2 feet (610 mm) above the highest point
where they pass through the roof and not less than
2 feet (610 mm) above any portion of a building
within 10 feet (3048 mm) horizontally.
3. As provided for industrial equipment in Section
503.2.2.
4. As provided for direct-vent systems in Section
503.2.3.
5. As provided for appliances with integral vents in
Section 503.2.4.
6. As provided for mechanical draft systems in
Section 503.3.3.
7. As provided for ventilating hoods and exhaust
systems in Section 503.3.4.
(IFGC, 2009 Edition, pg. 84)
503.2.2 Well-ventilated spaces. Where located in large
and well-ventilated space, industrial appliances shall be
permitted to be operated by discharging the ue gases
directly into the space.
503.2.3 Direct-vent appliances. Listed direct-vent
appliances shall be installed in accordance with the
manufacturer’s instructions and Section 503.8, Item 3.
503.2.4 Appliances with integral vents. Appliances
incorporating integral venting means shall be considered
properly vented where installed in accordance with the
manufacturer’s instructions and Section 503.8, Items 1
and 2.
503.3.4 Ventilating hoods and exhaust systems.
Ventilating hoods and exhaust systems shall be permitted
to be used to vent appliances installed in commercial
applications. Where automatically operated appliances
are vented through a ventilating hood or exhaust system
equipped with a damper or with a power means of
exhaust, provisions shall be made to allow the ow of
gas to the main burners only when the damper is open
to a position to properly vent the appliance and when the
power means of exhaust is in operation.
(IFGC, 2009 Edition, pg. 80)