34 Pa. Code § 41.101 – Retiring rooms for women.

(a) If more than one retiring room is provided, at least 1/2 of the retiring rooms shall be provided with a window or skylight opening directly to the outside air. If only one retiring room is provided, it shall have a window or skylight opening. In retiring rooms without windows or skylights opening directly to the outside air, § 41.91 (relating to retiring rooms for women) shall apply.
(b) In each existing building, new installations shall, if possible, conform to the requirements of subsection (a) of this section. If this is impossible, new installations in existing buildings may conform to § 41.91.

This section cited in 34 Pa. Code § 41.195 (relating to retiring rooms for women).