What are the two types of fit checks?

The two types of fit checks are referred to as negative pressure and positive pressure checks. Negative pressure fit checks involve the wearer inhaling gently while blocking the exhalation valve (if applicable) or placing their hands over the respirator’s filters. If done correctly, the respirator should collapse against the face, indicating a proper seal. This method assesses how well the respirator fits and forms a tight seal around the face.

Positive pressure fit checks involve exhaling gently while blocking the filters or valves. If the respirator inflates slightly and no air escapes, this indicates that the respirator is fitting properly. Both methods are crucial in ensuring that the respirator provides adequate protection from airborne contaminants, such as lead dust, during lead abatement activities.

Understanding these types of fit checks is essential for ensuring that workers are protected and can continue to work safely in environments where lead exposure is possible.