This section is a technical standard for building ventilation.
States like California or Illinois have 30 days to notify you if your application is complete. The certifying authority then has a "reasonable period of time" (not exceeding one year) to act on it. Chapter 401.1
This is often cited as "401" or "401 Certification" and is one of the most significant environmental regulations in the U.S.. This section is a technical standard for building
Chapter 4 (which includes 401.1) governs the ventilation of occupied spaces . Chapter 401.1