(1) Except as provided in Sentences (2) and (3), the clear opening height of doorways shall be not less than 2 030 mm high at,
(a) exit doors,
(b) doors that open into or are located within a public corridor, and
(c) doors that open into or are located within another facility that provides access to exit from a suite.
(2) The clear opening height under door closers and other devices in doorways described in Sentence (1) shall be not less than 1 980 mm.
(3) Doorways serving a house or an individual dwelling unit need not comply with Sentences (1) and (2).