What is the minimum type of respirator required for an asbestos fiber count of 1.8 fibers per cubic centimeter?

The correct choice indicates that a full face, negative pressure, air-purifying respirator is necessary for protection against exposure to asbestos fibers at a concentration of 1.8 fibers per cubic centimeter. This type of respirator provides adequate filtration capabilities to effectively remove hazardous asbestos fibers from the air before they can be inhaled, thus ensuring the respiratory safety of the wearer.

When working with asbestos, it is crucial to have appropriate respiratory protection, as even relatively low levels of asbestos can pose serious health risks. The full face design offers added protection by covering both the respiratory system and the eyes, ensuring that no asbestos fibers can enter through these openings during exposure.

In contrast, other options such as simple respirators do not offer enough filtration and protection against specific hazards like asbestos. Similarly, while a P.A.P.R. (Powered Air-Purifying Respirator) provides excellent protection through a battery-powered air supply, it may not be mandated at lower fiber concentrations compared to a standard full face, air-purifying respirator. Therefore, acknowledging the regulatory requirements and the nature of the contaminants at the specified concentration supports the choice of a full face, negative pressure, air-purifying respirator as the minimum necessary protective equipment in this scenario.