Guards and screens shall be supplied for protection against rodents and insects in accordance with the following requirements.

    A.    Guards for Basement Windows. Every basement or cellar window which is openable shall be supplied with corrosion-resistive, rodent-proof shields of not less than No. 22 U.S. gauge perforated steel sheets, or No. 20 B & S gauge aluminum, or No. 16 U.S. gauge expanded metal or wire mesh screens, with not more than one-half-inch mesh openings, or with other material affording equivalent protection against the entry of rodents, including storm windows.

    B.    Insect Screens. From June 1st to October 15th of each year, every door opening directly from any dwelling or multifamily dwelling to the outdoors, and every window or other outside opening used for ventilation purposes, shall be supplied with approved screening, and every swinging screen door shall have a self-closing device in good working condition, except that no such screens shall be required for a dwelling unit on a floor above the fifth floor. (Prior code § 17-1-12)