Code of Federal Regulations Title 32. National Defense § 32.2001.53 Open storage areas

(a) Construction. The perimeter walls, floors, and ceiling will be permanently constructed and attached to each other. All construction must be done in a manner as to provide visual evidence of unauthorized penetration.

(b) Doors. Doors shall be constructed of wood, metal, or other solid material. Entrance doors shall be secured with a built-in GSA–approved three-position combination lock. When special circumstances exist, the agency head may authorize other locks on entrance doors for Secret and Confidential storage. Doors other than those secured with the aforementioned locks shall be secured from the inside with either deadbolt emergency egress hardware, a deadbolt, or a rigid wood or metal bar which extends across the width of the door, or by other means approved by the agency head.

(c) Vents, ducts, and miscellaneous openings. All vents, ducts, and similar openings in excess of 96 square inches (and over 6 inches in its smallest dimension) that enter or pass through an open storage area shall be protected with either bars, expanded metal grills, commercial metal sounds baffles, or an intrusion detection system.

(d) Windows.