Page 26 - 2018_IFGC

DEFINITIONS

CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe [M] DRAFT. The pressure difference existing between the
and fittings, semirigid metallic tubing and fittings or a listed appliance or any component part and the atmosphere, that
and labeled device that connects an appliance to the gas pip- causes a continuous flow of air and products of combustion
ing system. through the gas passages of the appliance to the atmosphere.
CONNECTOR, CHIMNEY OR VENT. The pipe that con- Mechanical or induced draft. The pressure difference
nects an appliance to a chimney or vent. created by the action of a fan, blower or ejector that is
[A] CONSTRUCTION DOCUMENTS. All of the written, located between the appliance and the chimney or vent
graphic and pictorial documents prepared or assembled for termination.
describing the design, location and physical characteristics of Natural draft. The pressure difference created by a vent
the elements of the project necessary for obtaining a mechan- or chimney because of its height, and the temperature dif-
ical permit. ference between the flue gases and the atmosphere.
[M] CONTROL. A manual or automatic device designed to DRAFT HOOD. A nonadjustable device built into an appli-
regulate the gas, air, water or electrical supply to, or operation ance, or made as part of the vent connector from an appli-
of, a mechanical system. ance, that is designed to: provide for ready escape of the flue
CONVERSION BURNER. A unit consisting of a burner gases from the appliance in the event of no draft, backdraft or
and its controls for installation in an appliance originally uti- stoppage beyond the draft hood; prevent a backdraft from
lizing another fuel. entering the appliance; and neutralize the effect of stack
action of the chimney or gas vent upon operation of the appli-
COUNTER APPLIANCES. Appliances such as coffee ance.
brewers and coffee urns and any appurtenant water-heating
appliance, food and dish warmers, hot plates, griddles, waffle DRAFT REGULATOR. A device that functions to maintain
bakers and other appliances designed for installation on or in a desired draft in the appliance by automatically reducing the
a counter. draft to the desired value.
CUBIC FOOT. The amount of gas that occupies 1 cubic foot [M] DRIP. The container placed at a low point in a system of
3
(0.02832 m ) when at a temperature of 60°F (16°C), saturated piping to collect condensate and from which the condensate
with water vapor and under a pressure equivalent to that of 30 is removable.
inches of mercury (101 kPa). DRY GAS. A gas having a moisture and hydrocarbon dew
[M] DAMPER. A manually or automatically controlled point below any normal temperature to which the gas piping
device to regulate draft or the rate of flow of air or combus- is exposed.
tion gases. DUCT FURNACE. A warm-air furnace normally installed
DECORATIVE APPLIANCE, VENTED. A vented appli- in an air distribution duct to supply warm air for heating. This
ance wherein the primary function lies in the aesthetic effect definition shall apply only to a warm-air heating appliance
of the flames. that depends for air circulation on a blower not furnished as
part of the furnace.
DECORATIVE APPLIANCES FOR INSTALLATION
IN VENTED FIREPLACES. A vented appliance designed [M] DUCT SYSTEM. A continuous passageway for the
for installation within the fire chamber of a vented fireplace, transmission of air that, in addition to ducts, includes duct fit-
wherein the primary function lies in the aesthetic effect of the tings, dampers, plenums, fans and accessory air-handling
flames. equipment.
DEMAND. The maximum amount of gas input required per [A] DWELLING UNIT. A single unit providing complete,
unit of time, usually expressed in cubic feet per hour, or Btu/h independent living facilities for one or more persons, includ-
(1 Btu/h = 0.2931 W). ing permanent provisions for living, sleeping, eating, cooking
and sanitation.
[BS] DESIGN FLOOD ELEVATION. The elevation of the
“design flood,” including wave height, relative to the datum EQUIPMENT. Apparatus and devices other than appliances.
specified on the community's legally designated flood hazard EXCESS FLOW VALVE (EFV). A valve designed to acti-
map. In areas designated as Zone AO, the design flood eleva- vate when the fuel gas passing through it exceeds a pre-
tion shall be the elevation of the highest existing grade of the scribed flow rate.
building’s perimeter plus the depth number (in feet) specified EXTERIOR MASONRY CHIMNEYS. Masonry chimneys
on the flood hazard map. In areas designated as Zone AO exposed to the outdoors on one or more sides below the roof
where a depth number is not specified on the map, the depth line.
number shall be taken as being equal to 2 feet (610 mm).
[M] FIREPLACE. A fire chamber and hearth constructed of
DILUTION AIR. Air that is introduced into a draft hood and noncombustible material for use with solid fuels and pro-
is mixed with the flue gases. vided with a chimney.
DIRECT-VENT APPLIANCES. Appliances that are con- Factory-built fireplace. A fireplace composed of listed
structed and installed so that all air for combustion is derived factory-built components assembled in accordance with
directly from the outdoor atmosphere and all flue gases are the terms of listing to form the completed fireplace.
discharged directly to the outdoor atmosphere.

2018 INTERNATIONAL FUEL GAS CODE ® 13
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