Rules and regulations. From May 1 to October 1, every opening, except
bulkheads, used for ingress to or egress from a structure used for
human habitation directly to or from outdoor space shall be supplied
with either a self-closing device or a self-closing screen door, and
every window of every habitable room, bathroom, toilet room or compartment
and every other opening to outdoor space shall be equipped with approved
screening, provided that such screening is necessary for effective
protection against insects.