Page 568 - 2018_IRC

FUEL GAS

Automatic gas shutoff. A valve used in conjunction with that is capable of causing excessive condensate production
an automatic gas shutoff device to shut off the gas supply in the vent.
to a water-heating system. It shall be constructed inte- Category III. An appliance that operates with a positive
grally with the gas shutoff device or shall be a separate vent static pressure and with a vent gas temperature that
assembly. avoids excessive condensate production in the vent.
Individual main burner. A valve that controls the gas Category IV. An appliance that operates with a positive
supply to an individual main burner. vent static pressure and with a vent gas temperature that is
Main burner control. A valve that controls the gas supply capable of causing excessive condensate production in the
to the main burner manifold. vent.
Manual main gas-control. A manually operated valve in VENTED ROOM HEATER. A vented self-contained, free-
the gas line for the purpose of completely turning on or standing, nonrecessed appliance for furnishing warm air to
shutting off the gas supply to the appliance, except to pilot the space in which it is installed, directly from the heater
or pilots that are provided with independent shutoff. without duct connections.
Manual reset. An automatic shutoff valve installed in the VENTED WALL FURNACE. A self-contained vented
gas supply piping and set to shut off when unsafe condi- appliance complete with grilles or equivalent, designed for
tions occur. The device remains closed until manually incorporation in or permanent attachment to the structure of a
reopened. building, mobile home or travel trailer, and furnishing heated
air circulated by gravity or by a fan directly into the space to
Service shutoff. A valve, installed by the serving gas sup- be heated through openings in the casing. This definition
plier between the service meter or source of supply and the
customer piping system, to shut off the entire piping sys- shall exclude floor furnaces, unit heaters and central fur-
naces as herein defined.
tem.
VENTING SYSTEM. A continuous open passageway from
VENT. A pipe or other conduit composed of factory-made the flue collar or draft hood of an appliance to the outdoor
components, containing a passageway for conveying combus- atmosphere for the purpose of removing flue or vent gases. A
tion products and air to the atmosphere, listed and labeled for venting system is usually composed of a vent or a chimney
use with a specific type or class of appliance.
and vent connector, if used, assembled to form the open pas-
Special gas vent. A vent listed and labeled for use with sageway.
listed Category II, III and IV gas appliances. WALL HEATER, UNVENTED TYPE. A room heater of
Type B vent. A vent listed and labeled for use with appli- the type designed for insertion in or attachment to a wall or
ances with draft hoods and other Category I appliances partition. Such heater does not incorporate concealed venting
that are listed for use with Type B vents. arrangements in its construction and discharges all products
of combustion through the front into the room being heated.
Type BW vent. A vent listed and labeled for use with wall
furnaces. WATER HEATER. Any heating appliance or equipment
that heats potable water and supplies such water to the pota-
Type L vent. A vent listed and labeled for use with appli- ble hot water distribution system.
ances that are listed for use with Type L or Type B vents.
VENT CONNECTOR. See “Connector.”
VENT PIPING. SECTION G2404 (301)
GENERAL
Breather. Piping run from a pressure-regulating device to G2404.1 (301.1) Scope. This section shall govern the
the outdoors, designed to provide a reference to atmo- approval and installation of all equipment and appliances that
spheric pressure. If the device incorporates an integral
pressure relief mechanism, a breather vent can also serve comprise parts of the installations regulated by this code in
as a relief vent. accordance with Section G2401.
G2404.2 (301.1.1) Other fuels. The requirements for com-
Relief. Piping run from a pressure-regulating or pressure- bustion and dilution air for gas-fired appliances shall be gov-
limiting device to the outdoors, designed to provide for the
safe venting of gas in the event of excessive pressure in erned by Section G2407. The requirements for combustion
and dilution air for appliances operating with fuels other than
the gas piping system.
fuel gas shall be regulated by Chapter 17.
VENTED APPLIANCE CATEGORIES. Appliances that G2404.3 (301.3) Listed and labeled. Appliances regulated
are categorized for the purpose of vent selection are classified by this code shall be listed and labeled for the application in
into the following four categories:
which they are used unless otherwise approved in accordance
Category I. An appliance that operates with a nonpositive with Section R104.11. The approval of unlisted appliances in
vent static pressure and with a vent gas temperature that accordance with Section R104.11 shall be based on approved
avoids excessive condensate production in the vent. engineering evaluation.
Category II. An appliance that operates with a nonposi- G2404.4 (301.8) Vibration isolation. Where means for iso-
tive vent static pressure and with a vent gas temperature lation of vibration of an appliance is installed, an approved

2018 INTERNATIONAL RESIDENTIAL CODE ® 543
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