55 Pa. Code § 3270.91 – Exits.

(a) Stairways, hallways, exits from rooms, exits from the facility and other means of egress serving as an exit shall be unobstructed.
(b) Protective gates are permitted, if they open easily and are not disapproved by building codes or local ordinances.
(c) If a door or doorway opens or exits directly into a stairwell and if there is no landing beyond the door or doorway, the door shall be restricted from opening or shall be removed and a secure barrier to prevent access to the stairwell shall be erected.

This section cited in 55 Pa. Code § 3270.241 (relating to requirements specific to school-age programs).