- UL:
- Uunderwriters Laboratories.
- ULF:
- Ultra Low Flush. Widely used description of 1.6 gpf or less toilets.
- Ultracoil:
- True double wall heat exchanger.
- UNC:
- Unified Nation Coarse Thread. A standard kind of coarse straight thread used on fittings, nuts, and bolts. Not for pipes.
- Undercounter Sink:
- Type of installation in which a lavatory or sink is attached to the underside of a countertop.
- Underwriters Laboratories:
- A non-profit organization that evaluates and classifies the health and safety rosks of carious materials and products.
- UNF:
- Unified National Fine Thread. A standard kind of fine straight thread used on fittings, nuts, and bolts. Not for pipes.
- Uni-Fle:
- One piece stop and riser combination. One-piece supply.
- Uniformity Coefficient:
- A measure of the variation in particle sizes of ion exchange resins and filter media. It is defined as the ration of the size of particle that has 60% of the
material finer than itself, to the size of the particle that has 10% finer than itself.
- Union:
- A three piece fitting that joins two sections of pipe, but allows them to be disconnected without cutting the pipe.
- Unit Vent:
- A term commonly used in air conditioning and a short term for unit ventilator which is a fan used to blow across cooling coils. Not a normal plumbing term, however, McGraw-Hill Dictionary of Architecture & Construction says, "dual vent, common vent, unit vent" See "common vent".
- Universal Plumbing Code:
- A system of procedures designed to provide consumers with safe and sanitary plumbing systems and used throughout the United States by local jurisdictions.
- Urinal:
- A plumbing fixture which receives only liquid body waste and conveys the waste through a trap seal into a gravity drainage system.
- Urinal Strainers:
- Refers to a domed metal piece fastened to the bottom of an urinal to prevent debris from plugging the trapway of the unit.
- Usable storage:
- Percentage of hot water that can be drawn from a tank before the temperature drops to a point that it is no longer considered hot.
- USEPA:
- United States Environmental Protection Agency.
- USPHS:
- United States Public Health Service.
- Utility Sink:
- Deep fixed basin, supplied with hot and cold water, which is used for rinsing of mops, disposal of cleaning water.
|
