Page 565 - 2018_IRC

FUEL GAS

DRAFT REGULATOR. A device that functions to maintain on an appliance equipped with a draft hood or to the outlet of
a desired draft in the appliance by automatically reducing the the appliance on an appliance not equipped with a draft
draft to the desired value. hood.
DRIP. The container placed at a low point in a system of pip- FLUE COLLAR. That portion of an appliance designed for
ing to collect condensate and from which the condensate is the attachment of a draft hood, vent connector or venting sys-
removable. tem.
DUCT FURNACE. A warm-air furnace normally installed FLUE GASES. Products of combustion plus excess air in
in an air distribution duct to supply warm air for heating. This appliance flues or heat exchangers.
definition shall apply only to a warm-air heating appliance FLUE LINER (LINING). A system or material used to form
that depends for air circulation on a blower not furnished as the inside surface of a flue in a chimney or vent, for the pur-
part of the furnace.
pose of protecting the surrounding structure from the effects
DWELLING UNIT. A single unit providing complete, inde- of combustion products and for conveying combustion prod-
pendent living facilities for one or more persons, including ucts without leakage to the atmosphere.
permanent provisions for living, sleeping, eating, cooking
and sanitation. FUEL GAS. A natural gas, manufactured gas, liquefied
petroleum gas or mixtures of these gases.
EQUIPMENT. Apparatus and devices other than appli- FURNACE. A completely self-contained heating unit that is
ances.
designed to supply heated air to spaces remote from or adja-
EXCESS FLOW VALVE (EFV). A valve designed to acti- cent to the appliance location.
vate when the fuel gas passing through it exceeds a pre-
scribed flow rate. FURNACE, CENTRAL. A self-contained appliance for
heating air by transfer of heat of combustion through metal to
EXTERIOR MASONRY CHIMNEYS. Masonry chimneys the air, and designed to supply heated air through ducts to
exposed to the outdoors on one or more sides below the roof spaces remote from or adjacent to the appliance location.
line.
FURNACE PLENUM. An air compartment or chamber to
FIREPLACE. A fire chamber and hearth constructed of non- which one or more ducts are connected and that forms part of
combustible material for use with solid fuels and provided an air distribution system.
with a chimney.
GAS CONVENIENCE OUTLET. A permanently mounted,
Factory-built fireplace. A fireplace composed of listed manually operated device that provides the means for con-
factory-built components assembled in accordance with necting an appliance to, and disconnecting an appliance
the terms of listing to form the completed fireplace. from, the supply piping. The device includes an integral,
Masonry fireplace. A hearth and fire chamber of solid manually operated valve with a nondisplaceable valve mem-
masonry units such as bricks, stones, listed masonry units ber and is designed so that disconnection of an appliance
or reinforced concrete, provided with a suitable chimney. only occurs when the manually operated valve is in the closed
position.
FLAME SAFEGUARD. A device that will automatically
shut off the fuel supply to a main burner or group of burners GAS PIPING. An installation of pipe, valves or fittings
when the means of ignition of such burners becomes inopera- installed on a premises or in a building and utilized to convey
tive, and when flame failure occurs on the burner or group of fuel gas.
burners. HAZARDOUS LOCATION. Any location considered to be
FLASHBACK ARRESTOR CHECK VALVE. A device a fire hazard for flammable vapors, dust, combustible fibers
that will prevent the backflow of one gas into the supply sys- or other highly combustible substances. The location is not
tem of another gas and prevent the passage of flame into the necessarily categorized in the International Building Code as
gas supply system. a high-hazard use group classification.
FLOOD HAZARD AREA. The greater of the following two HOUSE PIPING. See “Piping system.”
areas: IGNITION PILOT. A pilot that operates during the lighting
1. The area within a floodplain subject to a 1 percent or cycle and discontinues during main burner operation.
greater chance of flooding in any given year. IGNITION SOURCE. A flame spark or hot surface capable
2. This area designated as a flood hazard area on a com- of igniting flammable vapors or fumes. Such sources include
munity’s flood hazard map, or otherwise legally desig- appliance burners, burner ignitors and electrical switching
nated. devices.
FLOOR FURNACE. A completely self-contained furnace INFRARED RADIANT HEATER. A heater that directs a
suspended from the floor of the space being heated, taking air substantial amount of its energy output in the form of infrared
for combustion from outside such space and with means for radiant energy into the area to be heated. Such heaters are of
observing flames and lighting the appliance from such space. either the vented or unvented type.
FLUE, APPLIANCE. The passage(s) within an appliance JOINT, FLARED. A metal-to-metal compression joint in
through which combustion products pass from the combus- which a conical spread is made on the end of a tube that is
tion chamber of the appliance to the draft hood inlet opening compressed by a flare nut against a mating flare.

540 2018 INTERNATIONAL RESIDENTIAL CODE ®
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