What is an Airlock?

AS 1428.1:2021 - 5.1 (iii) 

Entry doors to airlocks serving areas containing sanitary facilities shall be identified by the use of raised text and Braille, together with raised and visual symbols identifying each sanitary facility within.

NOTE 6 One symbol for each facility need only be used.

NOTE 7 Where the facilities for male and female are separate, a dividing line should be placed between each symbol.

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