Section 406.4.4 is added to read as follows: "Separation." Every opening located between a public garage and another occupancy shall be designed to prevent the transmission of liquids and vapors from entering adjacent occupancies. Sec. 406.6.2 A mechanical ventilation system and exhaust system shall be provided in accordance with Chapters 4 and 5 of the International Mechanical Code. Minimum ventilation Automatic operation of the system shall not reduce the ventilation airflow rate below 0.05 cfm per square foot (0.00025 m 3 /s × m 2 ) of the floor area and the system shall be capable of producing a ventilation airflow rate of 1.00 cfm per square foot (0.0005 m 3 /s × m 2 ) of floor area. Public open parking garages that do not have more than 20 percent of the linear perimeter facing to a fire access road shall be provided with a sprinkler system throughout the building as defined by Subtitle 11 of this Code.