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NATIONAL PIPE THREAD
National Pipe Thread, a standard method of sizing tapered threaded pipe.
NATIONAL PIPE THREAD STRAIGHT
A standard method of sizing straight threaded pipe.
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.