Plumbers School

A device, fitting or assembly of fittings installed in the building drain to prevent circulation of air between the drainage system of the building and the building sewer.

A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone.

A burner in which the air at atmospheric pressure is injected into the burner by a jet of gas.

A burner employing the energy of a jet of gas to inject air for combustion into the burner and mix it with the gas.

A burner in which secondary air only is depended on for the combustion of the gas.

A burner in which either gas or air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, this added pressure being applied at the burner.

A power burner in which all or nearly all of the air for combustion is mixed with the gas as primary air.

A burner which is supplied with an air-gas mixture under pressure (usually from 0.5 to 14 inches of water [124 to 3483 Pa] and occasionally higher).

A self-contained, gas burning appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply heated air through ducts to spaces remote from or adjacent to the appliance location.

A furnace designed with air flow essentially in a vertical path, discharging air at or near the bottom of the furnace.

A central furnace equipped with a fan or blower which provides the primary means for circulation of air.

A central furnace depending primarily on circulation of air by gravity.

A central furnace equipped with a fan or blower as an integral part of its construction and operable on gravity systems only. The fan or blower is to be used only to overcome the internal furnace resistance to air flow.

A furnace designed for low headroom installation with air flow through the appliance essentially in a horizontal path.

A furnace designed with air flow essentially in a vertical path, discharging air at or near the top of the furnace.

A vented gas-fired appliance comprising the following classes as defined herein: boiler, central furnace, floor furnace, or vented wall furnace.

Chimneys that are factory made, listed by a nationally recognized testing agency, for venting gas appliances, gas incinerators, and solid or liquid fuel burning appliances.

Field constructed chimneys built in accordance with nationally recognized codes or standards.

Chimneys made of metal ofO.135-inch (3.43 mm) minimum, galvanized or painted, unless suitably corrosion resistant, properly welded or riveted and built in accordance with nationally recognized codes or standards.

A vent that connects to a horizontal drainage branch and vents two traps to a maximum of eight traps or trapped fixtures connected into a battery.