Which of the following is true about respirators?

Respirators are essential personal protective equipment that must be fit-tested for each worker because a proper fit is critical for the effectiveness of the respirator in providing a safe breathing environment. Fit-testing ensures that there are no gaps between the respirator and the face, which could allow hazardous substances, such as dust, fumes, or airborne pathogens, to enter the respiratory system. The requirement for fit-testing is a part of occupational health and safety regulations aimed at protecting workers in various environments where inhalation hazards may be present. This measure accounts for the individual characteristics of each user's face and ensures the respirator performs as intended across different working conditions.

The other statements about respirators are not accurate. For instance, while respirators may be used during cleaning, they are not limited to this activity alone; they are necessary in various situations where respiratory protection is needed. Similarly, the scope of respirator usage is not confined to just working with liquids; they are vital in many tasks that expose workers to airborne contaminants, including gases, vapors, and particulate matter. Thus, the only accurate statement is about the requirement for fit-testing.