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A furnace or boiler which condenses part of the water vapor generated by the burning of hydrogen in fuels and in which the fraction of the total latent heat remaining in the flue gases after condensation is less than unity.
A pipe inside the building that conveys storm water from the roof to a storm or combined building drain.
A space whose volume is less than 50 cu ft per 1,000 Btu per hour (4.83 m3/kW) of the aggregate input rating of all appliances installed in that space.
All of the written, graphic and pictorial documents prepared or assembled for describing the design, location and physical characteristics of the elements of the project necessary for obtaining a building permit. The construction drawings shall be drawn to an appropriate scale.
CONSUMERS' GAS PIPING
All gas piping and fittings extending from the point of delivery to the outlets, exclusive of piping, meters, regulators, valves, fittings, etc., owned by the gas company, and exclusive of tanks, piping, meters, regulators, valves, fittings, etc., installed for the purpose of storing, delivering or regulating LP gas at pressures in excess of the pressure normally delivered to appliances. This includes yard line and/or building piping.
An impairment of the quality of the potable water that creates an actual hazard to the public health through poisoning or through the spread of disease by sewage, industrial fluids or waste.
A device designed to regulate the gas, air, water, or electrical supply to a gas appliance. It may be manual or automatic.
A burner designed to supply gaseous fuel to an appliance originally designed to utilize another fuel.
Any physical connection or arrangement between two otherwise separate piping systems, one of which contains potable water and the other either water of unknown or questionable safety or steam, gas or chemical, whereby there exists the possibility for flow from one system to the other, with the direction of flow depending on the pressure differential between the two systems.Â Â (see "Backflow").
CUBIC FOOT of GAS
The amount of gas which occupies 1 cu ft (0.02832 m3) when at a temperature of 60OP (16 C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa).
A branch leading from a soil, waste or vent pipe; a building drain; or a building sewer, and terminating at a developed length of 2 feet (610 mm) or more by means of a plug, cap or other closed fitting.
DECORATIVE APPLIANCE, VENTED
A vented appliance whose only function lies in the esthetic effect of the flames.
The maximum amount of gas required per unit of time, usually expressed in cubic feet per hour, or Btu per hour (1 Btu per hour = 0.2931 Watts), required for the operation of the appliance or appliances supplied.
DEPTH OF WATER SEAL
The depth of water that would have to be removed from a full trap before air could pass through the trap.
The length of a pipeline measured along the centerline of the pipe and fittings.
Air which enters a draft hood or draft regulator and mixes with flue gases.
DIRECT GAS-FIRED MAKE-UP AIR HEATER
A heater used to temper make-up air in which all the heat and products of combustion generated by the gas burner are released into the air stream being heated.
DIRECT VENT APPLIANCES
Appliances which are so constructed and installed that all air for combustion is derived from and all flue gases are discharged to the outside atmosphere.
A pipe that conveys the discharges from plumbing fixtures or appliances.
Ratio of the maximum probable demand to the maximum possible demand.