What are the two types of respirator fit checks?

The two types of respirator fit checks are indeed positive and negative pressure. These methods are essential for ensuring that the respirator forms a proper seal on the user's face, which is crucial for effective respiratory protection against airborne contaminants.

In a positive pressure fit check, the user places their hands over the respirator exhalation valve and exhales gently. If the respirator expands and no air leaks are felt, it indicates that a proper seal has been achieved. Conversely, during a negative pressure fit check, the user inhales sharply while covering the inhalation ports of the respirator. If the respirator collapses inward and there is a noticeable pull toward the face, this indicates a secure fit.

These fit checks are vital components of respirator use protocols, ensuring that users are adequately protected while working in environments where asbestos and other hazardous materials are present. Mastering these checks enhances overall safety and compliance with regulatory standards.

The other options do not accurately describe fit checks in this context. Visual and auditory methods are not standard checks for respirator fit; qualitative and quantitative refer to testing methods rather than basic fit checks; and functional and non-functional don't apply directly to the fit of a respirator.