What are common engineering controls used in asbestos abatement?

• A. Wetting
• B. Enclosure/containment with negative pressure
• C. Local exhaust ventilation
• D. All of the above

Answer: (D)

Wetting, enclosure/containment with negative pressure, and local exhaust ventilation are standard engineering controls used in asbestos abatement to limit airborne fibers. Wetting dampens the material so it’s less likely to release dust when disturbed. Enclosure and containment create a physical barrier around the work area and maintain negative pressure to prevent contaminated air from leaking into clean areas, directing air inward. Local exhaust ventilation captures fibers at the source and pulls them through filtration, reducing concentrations in the work zone. Together, these controls provide layered protection: moisture reduces release, containment traps fibers, and exhaust systems remove remaining contaminants. Because each control serves a distinct, complementary role and they are commonly used together, the most effective approach uses all of them.