Definition
An enclosed work area constructed with polyethylene sheeting and sealed to prevent the escape of asbestos fibers during removal work. Containment includes critical barriers, airlocks, decontamination units, and negative air pressure systems. The integrity of containment must be maintained throughout the project and verified through air monitoring and visual inspections.
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Decontamination Unit
A series of connected chambers that workers pass through when entering or exiting an asbestos work area. Typically consists of a dirty room (for removing contaminated protective equipment), shower room (for washing), and clean room (for donning clean clothes). Proper use of decontamination units is essential to prevent fiber migration and worker contamination.
Negative Air Unit (NAU)
A ventilation system equipped with HEPA filters that creates negative air pressure within an asbestos work area, preventing contaminated air from escaping the containment. The unit continuously draws air from the work area, filters it through HEPA filters, and exhausts clean air outside. Proper placement and operation of NAUs is critical for worker and public safety during asbestos removal.