Tex. Health and Safety Code § 791.037: EXTERIOR FIRE ESCAPE EXITS.

(a) An exit door leading to an exterior fire escape must open on a landing that is at least the width of the doors. The door must swing outward and be:

(1) at least three feet by six feet six inches;

(2) glazed with wire glass; and

(3) level at the bottom with the floors of the rooms or hallways and landings that it serves.

(b) An exit door may be secured only by panic hardware approved by the successor organization to the National Board of Fire Underwriters. Hooks, latches, bolts, locks, and similar devices are prohibited.

(c) A window may not be used as a means of access to an exterior fire escape.

Acts 1989, 71st Leg., ch. 678, Sec. 1, eff. Sept. 1, 1989.