Chapter 401.1 -

Systems for hazardous exhaust or energy recovery must also comply with Chapter 5 of the IMC. 3. ADA Standards for Accessible Design (Section 401.1)

This is often cited as "401" or "401 Certification" and is one of the most significant environmental regulations in the U.S.. Chapter 401.1

It mandates that every occupied space be ventilated by natural means (per Section 402) or mechanical means (per Section 403). Systems for hazardous exhaust or energy recovery must

It ensures that building paths, ramps, and elevators meet minimum accessibility requirements. 4. U.S. Foreign Affairs Manual (9 FAM 401.1) Chapter 401.1

Chapter 4 (which includes 401.1) governs the ventilation of occupied spaces .