A worker is performing abrasive blasting, which generates high levels of dust and fine particles, some of which are toxic. The work is conducted in an enclosed space. Which type of respiratory protection is most appropriate for this high-hazard environment?
- APowered air-purifying respirator (PAPR) with HEPA filters
- BHalf-mask air-purifying respirator with P100 filters
- CFull-facepiece supplied-air respirator (Type CE abrasive-blasting respirator)
- DN95 filtering facepiece respirator
Show answer & explanationAnswer & explanation
Correct answer: C. Full-facepiece supplied-air respirator (Type CE abrasive-blasting respirator)
Abrasive blasting in an enclosed space with toxic dust generates extremely high concentrations of contaminants that can quickly overwhelm air-purifying respirators. A supplied-air respirator (SAR), specifically a Type CE abrasive-blasting respirator, provides a continuous flow of clean, breathable air and full face, head, and neck protection, making it essential for such severe conditions.
Why the other options are wrong
- A. PAPRs offer higher protection than non-powered APRs but still rely on filtering ambient air and may not be sufficient for extremely high concentrations or oxygen-deficient environments.
- B. Half-mask APRs, even with P100 filters, may not provide adequate protection against extremely high concentrations of toxic dust, and lack eye/face protection.
- D. N95 respirators are for non-oil particulates and are insufficient for high concentrations or toxic dust in enclosed spaces.
Respirator Selection for High Hazard
For environments with extremely high contaminant concentrations, unknown hazards, or oxygen deficiency, atmosphere-supplying respirators (e.g., supplied-air respirators or SCBAs) are typically required over air-purifying respirators.
- Abrasive blasting creates very high particulate levels.
- Enclosed spaces can lead to oxygen deficiency or rapid contaminant buildup.
- Air-purifying respirators have limitations on contaminant concentration and require sufficient oxygen.
- Supplied-air respirators provide an independent source of clean air.
Memory trick: When it's Dangerous, Supply Your Air.