Weather stripping

The material applied along the edge of a door or window that is usually flexible and capable of spanning a gap between a door edge and the door casing. The strip of material prevents the entry of air.

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.

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....