SECTION PM-403  VENTILATION
PM-403.1 Habitable spaces. Every habitable space shall have at least one openable window. The total openable area of the window in every room shall be equal to at least forty-five percent (45%) of the minimum glazed area required in Section PM-402.1.
Exception: Where rooms and spaces without openings to the outdoors are ventilated through an adjoining room, the unobstructed opening to the adjoining room shall be at least eight percent (8%) of the floor area of the interior room or space, but not less than 25 square feet (2.33 m 2). The ventilation openings to the outdoors shall be based on a total floor area being ventilated.
PM-403.2 Bathrooms and toilet rooms. Every bathroom and toilet room shall comply with the ventilation requirements for habitable spaces as required by Section PM-403.1, except that a window shall not be required in such spaces equipped with a mechanical ventilation system. Air exhausted by a mechanical ventilation system from a bathroom or toilet room shall discharge to the outdoors and shall not be recirculated.
PM-403.3 Cooking facilities. Unless approved through the certificate of occupancy, cooking shall not be permitted in any rooming unit or dormitory unit, and a cooking facility or appliance shall not be permitted to be present in the rooming unit or dormitory unit.
Exceptions:
   1.   Where specifically approved in writing by the code official.
   2.   Devices such as coffee pots and microwave ovens shall not be considered cooking appliances.
PM-403.4 Process ventilation. Where injurious, toxic, irritating or noxious fumes, gases, dusts or mists are generated, a local exhaust ventilation system shall be provided to remove the contaminating agent at the source. Air shall be exhausted to the exterior and not be recirculated to any space.
PM-403.5 Clothes dryer exhaust. Clothes dryer exhaust systems shall be independent of all other systems and shall be exhausted outside the structure in accordance with the manufacturer's instructions.
Exception: Listed and labeled condensing (ductless) clothes dryers.