How many types of respirators are commonly used in asbestos projects?

The correct answer identifies that there are four commonly used types of respirators in asbestos projects. Understanding these types is crucial because each one serves a specific function based on the level of exposure anticipated and the type of work being conducted.

In asbestos projects, appropriate respiratory protection is vital due to the hazardous nature of asbestos fibers. The four main types include:

1. Air-Purifying Respirators (APRs) - These include disposable N95 or P100 masks, which filter out particulate matter. They're effective for lower levels of exposure but may not protect against higher concentrations.

2. Powered Air-Purifying Respirators (PAPRs) - These provide a higher level of protection through a battery-operated fan that draws air through filters. They are beneficial when increased comfort and air flow is needed for longer durations.

3. Supplied-Air Respirators (SARs) - These deliver clean, breathable air from a stationary source, providing a high level of protection and are often used in higher-risk environments where asbestos levels are particularly dangerous.

4. Self-Contained Breathing Apparatus (SCBA) - This type is used when entering atmospheres that are immediately dangerous to life or health (IDLH), as it provides