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NATIONAL SANITATION FOUNDATION
A testing laboratory.
NATURAL DRAFT VENTING SYSTEM
A venting system designed to remove flue or vent gases under non positive static vent pressure entirely by natural draft.
A short length of pipe or tubing.
Water not safe for drinking or personal or culinary utilization.
Public nuisance as known as common law or in equity jurisprudence; whatever is dangerous to human life or detrimental to health; whatever structure or premises is not sufficiently ventilated, sewer, drained, cleaned or lighted, with respect to its intended occupancy; and whatever renders the air or human food or drink or water supply unwholesome.
The purpose for which a building or portion thereof is utilized or occupied.
A combination of approved bends that makes two changes in direction bringing one section of the pipe out of line but into a line parallel with the other section.
Outside the structure.
The opening in a cap, spud or other device whereby the flow of gas is limited and through which the gas is discharged to the burner.
ORIFICE CAP (HOOD)
A movable fitting having an orifice which permits adjustment of the flow of gas by the changing of its position with respect to a fixed needle or other device.
A removable plug or cap containing an orifice and which permits adjustment of the flow of gas either by substitution of a spud with a different sized orifice or by the motion of a needle with respect to it.
A threaded connection or bolted flange in a pipe system to which a gas burning appliance is or may be attached. Outlets must be located in the room or space where the appliance is or may be installed.
OXYGEN DEPLETION SAFETY SHUT -OFF
A system designed to act to shut off the gas supply to the main and pilot burners if the oxygen in the surrounding atmosphere is reduced below a predetermined level.
A small flame which is utilized to ignite the gas at the main burner or burners.
A rigid conduit of iron, steel, copper, brass, or plastic.
Where the word piping is used in this code, it refers to either pipe or tubing, or both.
A plastic which is capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature.
A plastic which is capable of being changed into a substantially infusible or insoluble product when cured under application of heat or chemical means.
Air compartment or chamber to which one or more ducts are connected and which forms part of an air distribution system.
The practice, materials and fixtures utilized in the installation, maintenance, extension and alteration of all piping, fixtures, plumbing appliances and plumbing appurtenances, within or adjacent to any structure, in connection with sanitary drainage or storm drainage facilities; venting systems; and public or private water supply systems. Not included in this definition are installations of chilled water piping in connection with refrigeration, process and comfort cooling; hot water piping in connection with building heating; and piping for fire protection systems.