"Under Mechanically Ventilated Spaces, above Case 1. Systems Able to Meet Required Outdoor Airflow Rates, add the following:
Multifamily only
Air-handling units serving common areas and residential units without operable windows must meet either Case 1 or Case 2.

Under Naturally ventilated spaces, after the existing paragraph, add the following:
Multifamily only
In residential units with operable windows, have an operable window in each bedroom. The total openable window area in each bedroom must be a minimum of 4% of the net occupiable floor area or be capable of supplying at least 10 cubic feet per minute (5 liters per second) of outdoor air per person.

In each full bathroom, have either an exhaust fan that vents directly to the outdoors or an operable window.

Above Performance, add the following:
Multifamily only

In addition to the requirements above, each dwelling unit must meet all of the following requirements:
• Gas-fired ovens and ranges must be vented or a carbon monoxide monitor must be installed.
• For residential units with combustion equipment that is not direct vented or power vented, carbon monoxide monitors must be installed on each floor.
• Unvented combustion appliances (e.g., decorative logs) are not allowed.
• All indoor fireplaces and woodstoves must have solid glass enclosures or doors that seal when closed.
• Any indoor fireplaces and woodstoves that are not closed combustion or power-vented must pass a backdraft potential test to ensure that depressurization of the combustion appliance zone is less than 5 Pa.
• For projects in high risk radon areas (EPA radon zone 1 or international equivalent), conduct a test at least once every five years to verify that radon levels are less than 4 pCi/L. If the region’s radon risk is unknown, testing must be conducted.