Definition
Personal protective equipment (PPE) worn when working with asbestos-containing materials. While specific requirements vary by jurisdiction and the nature of the work, core elements are consistent across most national regulations. Respiratory protective equipment (RPE): at minimum, an FFP3 (or P3-equivalent) half-mask respirator for low-disturbance work; a full-face respirator or powered air-purifying respirator (PAPR) with P3 filters for higher-disturbance or licensed removal work. Protective clothing: disposable Type 5 (or equivalent) coverall with hood and boot covers, disposable nitrile gloves, and rubber boots. RPE must be individually face-fit tested — a mask that does not seal correctly to the wearer provides no meaningful protection. All disposable PPE used in asbestos work must be treated as asbestos-contaminated waste: double-bagged in clearly labelled sacks and disposed of at a licensed facility. PPE must not be removed from the decontamination area for reuse.
See also:
Containment
An enclosed work area built from polyethylene sheeting and sealed to prevent asbestos fibers from escaping during removal. It includes barrier walls, airlocks, decontamination units, and a negative air pressure system. Containment integrity must be maintained throughout the project and verified by air monitoring and visual inspections.
Decontamination Unit
A set of connected chambers through which workers pass when entering or leaving an asbestos work area. The sequence runs: dirty room (removing contaminated PPE), shower room (washing), clean room (putting on clean clothes). Workers who skip or shortcut the sequence carry fibers out of the work area with them.
HEPA Filter
HEPA (High-Efficiency Particulate Air) filters capture 99.97% of particles 0.3 micrometers or larger, including asbestos fibers. Negative air units, vacuum cleaners, and air monitoring equipment used in asbestos work all rely on HEPA filtration. Filters must be tested regularly and replaced on schedule; a degraded HEPA filter breaks containment and puts workers at risk.
Negative Air Unit (NAU)
A ventilation system with HEPA filters that maintains negative air pressure inside an asbestos work area, so contaminated air cannot escape. The unit draws air continuously from the work area, passes it through HEPA filters, and exhausts clean air outside. Incorrect placement or operation allows contaminated air to leak, putting workers and nearby occupants at risk.