Page 27 - 2018_IFGC

DEFINITIONS

Masonry fireplace. A hearth and fire chamber of solid the air, and designed to supply heated air through ducts to
masonry units such as bricks, stones, listed masonry units spaces remote from or adjacent to the appliance location.
or reinforced concrete, provided with a suitable chimney. FURNACE, ENCLOSED. A specific heating, or heating
FIRING VALVE. A valve of the plug and barrel type and ventilating, furnace incorporating an integral total enclo-
designed for use with gas, and equipped with a lever handle sure and using only outside air for combustion.
for manual operation and a dial to indicate the percentage of FURNACE PLENUM. An air compartment or chamber to
opening. which one or more ducts are connected and that forms part of
FLAME SAFEGUARD. A device that will automatically an air distribution system.
shut off the fuel supply to a main burner or group of burners GAS CONVENIENCE OUTLET. A permanently mounted,
when the means of ignition of such burners becomes inopera- manually operated device that provides the means for con-
tive, and when flame failure occurs on the burner or group of necting an appliance to, and disconnecting an appliance
burners. from, the supply piping. The device includes an integral,
FLASHBACK ARRESTOR CHECK VALVE. A device manually operated valve with a nondisplaceable valve mem-
that will prevent the backflow of one gas into the supply sys- ber and is designed so that disconnection of an appliance
tem of another gas and prevent the passage of flame into the only occurs when the manually operated valve is in the closed
gas supply system. position.
[BS] FLOOD HAZARD AREA. The greater of the follow- GAS PIPING. An installation of pipe, valves or fittings
ing two areas: installed on a premises or in a building and utilized to convey
1. The area within a floodplain subject to a 1 percent or fuel gas.
greater chance of flooding in any given year. [F] GASEOUS HYDROGEN SYSTEM. See Section 702.1.
2. This area designated as a flood hazard area on a com- [M] HAZARDOUS LOCATION. Any location considered
munity’s flood hazard map, or otherwise legally desig- to be a fire hazard for flammable vapors, dust, combustible
nated. fibers or other highly combustible substances. The location is
FLOOR FURNACE. A completely self-contained furnace not necessarily categorized in the building code as a high-
suspended from the floor of the space being heated, taking air hazard group classification.
for combustion from outside such space and with means for HOUSE PIPING. See “Piping system.”
observing flames and lighting the appliance from such space. [F] HYDROGEN FUEL-GAS ROOM. See Section 702.1.
Fan type. A floor furnace equipped with a fan that pro- HYDROGEN-GENERATING APPLIANCE. See Section
vides the primary means for circulating air. 702.1.
Gravity type. A floor furnace depending primarily on cir- IGNITION PILOT. A pilot that operates during the lighting
culation of air by gravity. This classification shall also cycle and discontinues during main burner operation.
include floor furnaces equipped with booster-type fans
that do not materially restrict free circulation of air by [M] IGNITION SOURCE. A flame, spark or hot surface
gravity flow when such fans are not in operation. capable of igniting flammable vapors or fumes. Such sources
include appliance burners, burner ignitors and electrical
FLUE, APPLIANCE. The passage(s) within an appliance switching devices.
through which combustion products pass from the combus-
tion chamber of the appliance to the draft hood inlet opening INCINERATOR. An appliance used to reduce combustible
on an appliance equipped with a draft hood or to the outlet of refuse material to ashes and that is manufactured, sold and
the appliance on an appliance not equipped with a draft hood. installed as a complete unit.
INDUSTRIAL AIR HEATERS, DIRECT-FIRED NON-
FLUE COLLAR. That portion of an appliance designed for
the attachment of a draft hood, vent connector or venting sys- RECIRCULATING. A heater in which all the products of
tem. combustion generated by the burners are released into the air
stream being heated. The purpose of the heater is to offset
FLUE GASES. Products of combustion plus excess air in building heat loss by heating only outdoor air.
appliance flues or heat exchangers.
INDUSTRIAL AIR HEATERS, DIRECT-FIRED
[M] FLUE LINER (LINING). A system or material used to RECIRCULATING. A heater in which all the products of
form the inside surface of a flue in a chimney or vent, for the combustion generated by the burners are released into the air
purpose of protecting the surrounding structure from the stream being heated. The purpose of the heater is to offset
effects of combustion products and for conveying combus- building heat loss by heating outdoor air, and, if applicable,
tion products without leakage to the atmosphere. indoor air.
FUEL GAS. A natural gas, manufactured gas, liquefied INFRARED RADIANT HEATER. A heater that directs a
petroleum gas or mixtures of these gases. substantial amount of its energy output in the form of infrared
[M] FURNACE. A completely self-contained heating unit radiant energy into the area to be heated. Such heaters are of
that is designed to supply heated air to spaces remote from or either the vented or unvented type.
adjacent to the appliance location. [M] JOINT, FLANGED. A joint made by bolting together a
FURNACE, CENTRAL. A self-contained appliance for pair of flanged ends.
heating air by transfer of heat of combustion through metal to

14 2018 INTERNATIONAL FUEL GAS CODE ®
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