§ 14-189. Light and ventilation.

(a)

Natural light. All habitable rooms, except those located in basements, shall be provided with natural light by means of glazed openings of at least eight percent of the net floor area.

(b)

Ventilation. Natural or mechanical ventilation shall be provided as follows:

(1)

Natural ventilation. All habitable rooms, except kitchens and bathrooms, shall be provided with natural ventilation by means of openable exterior doors or windows of at least 3.5 percent of the net floor area.

(2)

Mechanical ventilation. Where a mechanical ventilation system is provided in lieu of openable exterior openings providing natural ventilation, the system shall be capable of providing at least one air change per hour. Exhaust ventilation shall terminate outside the building.

(c)

Cold-side venting. Cold-side venting of insulation shall be provided at roof/attic, flat-roof/ceiling and sloping-roof/ceiling assemblies. Ventilation shall be provided at the rate of one square foot of free ventilating area for each 300 square feet of area. At least 50 percent of the vents shall be located at the soffit area.

(d)

Crawl space venting. Unheated crawl spaces shall be provided with a minimum of two ventilators located at opposite sides of the crawl space.

(e)

Exhaust fan venting. Exhaust fans are required in all baths, shower rooms, utility rooms, when no openable window is available. Kitchen must have an exhaust fan. Clothes dryers must be vented to the outside.

(Code 1983, § 30.15(4)(a)—(e))