A. Minimum ventilation requirements for habitable spaces in group R occupancies. Every habitable space shall have at least one openable window. The total openable area of the window in every habitable space shall be equal to 50 percent of the minimum glazed area required in VMC Section 17.14.080(A)(1), as that section currently exists or as it may be subsequently amended.

B. Ventilation from adjoining rooms. 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 8 percent of the floor area of the interior room or space, but not less than 25 square feet. The ventilation openings to the outdoors shall be based on total floor area being ventilated.

C. Mechanical ventilation. In lieu of required exterior openings for ventilation, a mechanical ventilating system may be provided. Such system shall be capable of providing two air changes per hour with a minimum of 15 cubic feet per minute of outside air per occupant during such time as the building is occupied.

D. Ventilation requirements in bathrooms and toilet rooms. Every bathroom and toilet room shall comply with the ventilation requirements for habitable spaces, 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 be re-circulated. (Ord. M-4079 §25, 2014; Ord. M-3637 §1, 2003)