1331.04  INFESTATION AND SCREENING.
   (a)   Grounds, buildings and structures shall be maintained free of insect, vermin and rodent harborage and infestation.  Methods used for exterminating insects, vermin and rodents shall conform with generally accepted practice.
   (b)   Where the potential for rodent or vermin infestation exists, windows and other openings in basements and cellars shall be appropriately screened with wire mesh or other suitable materials.
   (c)   From May 1, to October 1, entrances to residential buildings shall be provided with self-closing type devices or screens, and windows and other openings used for ventilation shall be appropriately screened.  Screens shall not be required in rooms located sufficiently high in the upper stories of multiple dwellings as to be free of mosquitos, flies and other flying insects.