Bloomfield, Conn., Code of Ordinances ch. 12 § 12-37

(a) All windows, doors and openings shall be kept in good repair and workable condition and shall be easily opened and closed by the occupants of the premises.
(b) Every window, exterior door and hatchway or similar device shall be so constructed as to exclude insects during that portion of the year when there is a need for protection against mosquitoes, flies, and other flying insects.
(c) No broken, cracked, or missing windowpanes shall be allowed.
(d) Every doorway used for ventilation and opening directly from a dwelling unit to outside space shall have supplied properly fitting screens having at least sixteen (16) mesh and shall have a safe closing device.
(e) Every window or other device with openings to outdoor space shall be supplied with screens fixed to the frame, except that such screens shall not be required in rooms deemed by the director of health to be located high enough as to be free from such insects and/or in rooms located in areas of the Town of Bloomfield which are deemed by the director of health to have so few insects as to render screens unnecessary
(f) All openings in the exterior walls, foundations, basements, ground or first floors and roofs which have a half-inch diameter or more opening shall be rodent-proofed in an approved manner if they are within forty-eight (48) inches of the existing exterior ground level immediately below such openings or if such opening may be reached by rodents from the ground by climbing unguarded pipes, wires, cornices, stairs, roofs and other items, such as trees or vines or by burrowing.
(g) All windows located at or near ground level used or intended to be used for ventilation, all other openings located at or near ground level and all exterior doorways which might provide an entry for rodents shall be supplied with adequate screens or such other devices as will effectively prevent the entrance of rodents into the premises.
(h) The owner of a dwelling unit shall be responsible for providing and hanging all screens and double or storm doors and windows whenever the same are required under the provisions of this code or any rule or regulation adopted pursuant thereto, except where there is a written agreement between the owner and occupant obligating the occupant to do so. In the absence of such an agreement, maintenance or replacement of screens, storm doors and windows, once installed in any one season, becomes the responsibility of the occupant. The occupant's responsibility shall be exclusive to his or her dwelling unit.
(i) The owner shall ensure that windows and doors accessible from the outside have working locks on the interior side.