§ 13-70. Ventilation—Generally.

Every habitable room shall have a ventilation system adequate for the purpose for which the room is used. Natural ventilation shall be deemed to be adequate for habitable rooms when the total area openable to the outside air (by means of windows, louvers, monitors or other direct openings excluding doors) is five percent of the floor area of the habitable room, except that when:

(1)

Any portion of the room is more than 16 feet from a required opening, the aggregate clear area of the openings shall be not less than six percent.

(2)

A room has openable areas on two or more sides thereof, the total openable area shall be at least four percent of the total floor area of such room.

(3)

The openable area faces a wall or other obstruction at a distance of less than ten feet, the effective area shall be computed at not more than 80 percent of the actual openable area.

(4)

The openable area opens onto an enclosed porch, the enclosed porch shall have an openable area of at least three times the total required area of the openings onto such porch.

(Code 1973, § 12-79)