Weatherhood

The hood or deflector on a vent opening that is intended to prevent rain water and undesired unconditioned air entry.

Weir

A barrier across a stream of liquid that is used to divert or measure flow per unit of time.

Whisker coils

Whisker coils refers to air conditioning coils where there are no flat plate fins but heat transfer is accelerated by whiskers of metal attached to a tube carrying the liquid used for heating or cooling.

Usage

The act of using something such as electrical power. One refers to electrical energy consumption as power usage over a period of time.

GFCI

Ground-Fault Circuit-Interrupter A device intended for the protection of personnel that functions to de-energize a circuit or portion thereof within an established period of time when a ground-fault current exceeds the values established for a Class A device....