1202.5 Add a second paragraph and a third paragraph as follows:
In other than high-rise buildings, public corridors, public hallways and other public spaces having openings into adjoining dwelling units, guest rooms, or congregate residences within R-1 and R-2 Occupancies, shall be provided with natural ventilation by means of openable exterior openings with an area of not less than 1/25 of the floor area of such rooms or spaces with a minimum of 4 square feet (0.37 m2).
In lieu of required exterior openings for natural ventilation, a mechanical ventilating system may be provided. Such system shall be capable of providing two air changes per hour in public corridors, public hallways and other public spaces having openings into adjoining dwelling units, guest rooms, or congregate residences with R-2 occupancies, with a minimum of 7-1/2 cubic feet per minute (3-1/2 L/s) of outside air per occupant during such time as the building is occupied.
1202.6 Add a second paragraph as follows:
For all buildings containing any sensitive land use located within the Air Pollutant Exposure Zone, as determined by the Director of Public Health pursuant to Article 38 of the San Francisco Health Code, that are:
(a) Newly constructed;
(b) Undergoing a “Major Alteration to Existing Building” as defined by the San Francisco Green Building Code; or
(c) Applying for a San Francisco Planning Department-permitted Change of Use, such buildings shall incorporate an enhanced ventilation system designed and constructed to be in compliance with San Francisco Health Code Article 38.