All of the ventilation requirements are mandatory measures. Some measures require acceptance testing, which is addressed in Section 4.3.12.. Within a building, all enclosed spaces that are normally used by humans must be continuously ventilated during occupied hours with outdoor air, using either natural or mechanical ventilation §120.1(a)1 An exception is provided to §120.1(a)1 for ... Ventilate Right: Ventilation Guide for New and Existing California Homes. Ventilation and Health; California's Ventilation Requirements; ASHRAE Standard 62.2; Resources; About RESAVE; Step 1. Assess the Home; Step 2. Kitchen and Bath Ventilation; Step 3. Whole-Building Ventilation Rate; Step 4. Whole-Building Ventilation Type; Step 5. Control ...