The opening at the base of a refuse chute through which the refuse drops into a refuse container or refuse […]

Any lamp that produces light by means of phosphors as a result of an electrical discharge through one or more

The energy per unit weight of fluid on the discharge side of a pump.

A swinging stair, usually a folding ladder, which enables passage to an attic space or loft. The stair is fixed

Glare that reduces visual performance and visibility and often is accompanied by discomfort.

The ability of a paint coating (or the like) to resist soiling by foreign material deposited on, or embedded in,

See luminaire dirtdepreciation factor .