What is the primary purpose of Class 4 work?

• A. To regulate large demolition projects
• B. To regulate custodial work around nonfriable materials
• C. To regulate removal of TSI
• D. To regulate encapsulation of ACM

Answer: (B)

Class 4 work is about custodial and housekeeping tasks in areas where asbestos-containing materials are present, with the goal of preventing fiber release during routine cleaning and related activities. This category focuses on how cleaners and maintenance staff handle, clean, and manage areas without disturbing materials in a way that could release asbestos fibers, especially around nonfriable materials. In practice, it means following specific procedures for cleaning, using appropriate equipment, and applying protective measures to keep fiber exposure low during ordinary custodial work. The other activities described—large demolition, removal of thermal system insulation, or encapsulation of ACM—fall under different classes that address more disruptive or treatment-specific work rather than routine custodial tasks.