Which of the following is required for a filter cartridge to be used in air-purifying respirators?

For a filter cartridge to be effectively used in air-purifying respirators, it must be specifically designed to handle the contaminants that a user may encounter in their environment. This specificity is crucial because different filter cartridges are engineered to capture different types of particles, vapors, or gases. Therefore, it is not enough for a cartridge to be generic; it must match the chemical and physical properties of the contaminants present during exposure.

Using a filter cartridge that is not specific to the identified contaminants could lead to inadequate protection, as the respirator might not filter out harmful substances effectively. This specificity helps ensure that the user is receiving the appropriate level of protection from the hazardous materials they may face, making it an essential requirement for the safe use of air-purifying respirators.