When food service openings to the outside are used in restaurants, they shall have an area not exceeding 270 square inches with a maximum width of 18 inches and a maximum height of 15 inches. Triangular wide base openings with a height not exceeding 24 inches shall be allowed. Additional service openings shall be separated by a minimum of three feet. Such openings shall be closeable, at least with a wire screen of not coarser than 16 mesh, when not in use. Each opening shall be further protected by overhead fans or internal positive pressure which would produce an outward air flow of at least 75 linear feet per minute, as measured by a standard velometer, or have a system of duct work such that the discharge of air produces such outward flow of air through the opening.
('66 Code, § 6-2.27) (Ord. 433-A, passed 12-22-58) Penalty, see §§ 1-2.01 et seq.