Asbestos Contractor/Supervisor Practice Exam

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Which type of respirator offers the highest protection factor according to OSHA?

Half-mask respirator
Hood/helmet type Powered Purifying Respirator
Full-face respirator
Disposable mask

The correct answer is: Hood/helmet type Powered Purifying Respirator

The hood or helmet type Powered Air-Purifying Respirator (PAPR) offers the highest protection factor according to OSHA standards. This type of respirator utilizes a battery-powered blower that forces air through filters into a hood or helmet, providing a clean air supply to the wearer. One of the significant advantages of PAPRs is that they not only protect the respiratory system from airborne contaminants, including asbestos fibers, but also provide facial protection and may cover a larger portion of the head and neck. This enhances the overall protection and comfort of the user, especially in environments with hazardous materials. In comparison, half-mask respirators limit coverage to the lower portion of the face, which may leave the eyes and face exposed to potential hazards. Full-face respirators provide better coverage than half-masks, as they protect both the respiratory system and the eyes. However, they do not typically offer the same level of protection as PAPRs due to the reliance on a mechanical filter and potential for leakage. Disposable masks, on the other hand, offer minimal protection and are primarily suited for low-risk situations.