Definition
High-Efficiency Particulate Air filter capable of capturing 99.97% of particles 0.3 micrometers or larger, including asbestos fibers. HEPA filtration is essential for negative air units, vacuum cleaners, and air monitoring equipment used in asbestos work. Regular testing and replacement of HEPA filters is critical to maintain containment and worker protection during asbestos removal operations.
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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.
Containment
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.