Definitions of Terms under Alphabet A

A wood or aluminum ‘post’ attached on the latch-side edge of one of a set of paired or double doors, which covers the space between doors when they are closed. Which acts like a stop for the active door.

Annealed Glass

Glass which has been heat strengthened or tempered.

Air Infiltration

Air passing through a door unit when the door is under pressure, usually from wind.

Affidavit Label

A label that is placed on a fire-rated door in that a manufacturer states that the door meets certain test criteria.


In paired doors, the hinged door leaf which is primarily operable.