1203.5.1.1.2 Adjoining spaces.
BC § 1203.5.1.1.2
Where occupiable rooms and spaces without openings to the outdoors are ventilated through an adjoining room, the opening to the adjoining room shall be unobstructed and shall have an area of not less than 8 percent of the floor area of the interior room or space, but not less than 25 square feet (2.3 m 2 ). The openable area of the openings to the outdoors shall be based on the total floor area being ventilated. Exception: Exterior openings required for ventilation shall be permitted to open into a sunroom or covered patio provided that the openable area between such sunroom addition or covered patio and the interior room shall have an area of not less than 8 percent of the floor area of the interior room or space, but not less than 20 square feet (1.9 m 2 ). The openable area of the openings to the outdoors shall be based on the total floor area being ventilated.
