active door

active door

[′ak·tiv ′dȯr]
(building construction)

active door

In a pair of doors, the leaf, 1 that is the first to open and is the leaf to which a lock is applied.

active leaf, active door

In a door having a pair of leaves, that leaf to which the latching or locking mechanism is attached; usually the leaf that is permitted to open first; sometimes both leaves are active.
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