OSHA 10-Hour Construction ReviewPersonal Protective Equipment (PPE)Hard
A painter is using a spray gun to apply industrial coatings in a poorly ventilated area. The Material Safety Data Sheet (MSDS) indicates that the coating contains hazardous volatile organic compounds (VOCs) that can cause respiratory irritation and organ damage upon inhalation. Which type of respiratory protection is generally required for this task?
- ASupplied-air respirator (SAR)
- BSurgical mask
- CDust mask (N95 respirator)
- DAir-purifying respirator with appropriate cartridges
Show answer & explanationAnswer & explanation
Correct answer: A. Supplied-air respirator (SAR)
When dealing with hazardous VOCs in poorly ventilated areas, especially from spray applications, an air-purifying respirator may not provide sufficient protection due to high contaminant concentrations or oxygen deficiency. A supplied-air respirator (SAR) provides a clean, independent air supply, which is critical for such environments where air contaminants are high or unknown.
Why the other options are wrong
- B. Surgical masks offer no protection against chemical vapors or fine particulates.
- C. Dust masks (N95) protect only against particulates, not chemical vapors or gases.
- D. Air-purifying respirators with cartridges are suitable for certain vapor concentrations, but may be insufficient in poorly ventilated areas with high VOCs, or if oxygen is deficient.
Respiratory Protection Types
Respiratory protective equipment is categorized into air-purifying respirators (APRs) and atmosphere-supplying respirators (ASRs), each designed for specific hazards and environments.
- APRs filter contaminants from ambient air; require sufficient oxygen and known contaminant levels.
- ASRs (e.g., SARs, SCBAs) provide an independent supply of breathable air; suitable for high concentrations, IDLH, or oxygen-deficient atmospheres.
- Selection depends on contaminant type, concentration, oxygen level, and regulatory requirements.
Memory trick: Always Consider Oxygen and Contaminant Levels First.