Code of Federal Regulations Title 9. Animals and Animal Products § 9.354.220 Buildings

(1) The doors, windows, skylights, and other outside openings of the plant, except receiving rooms and live rabbit holding rooms, shall be protected by properly fitted screens or other suitable devices against the entrance of flies and other insects.

(2) Outside doors, except in receiving rooms and live rabbit holding rooms, shall be self-closing and so hung that not over 1/4 –inch clearance remains when closed. Screen doors shall open toward the outside of the building.