What limitation do APRs have regarding protection?

APRs, or Air-Purifying Respirators, have a specific limitation in that they do not provide universal respirator protection, which makes option B the correct choice. These devices are designed to filter out specific contaminants from the air, such as particulate matter, gases, or vapors, based on the type of filter or cartridge used. However, they cannot protect against all possible airborne hazards—especially in environments where oxygen levels are low or where there are unknown contaminants.

For instance, while an APR can effectively filter certain air pollutants, it may not guard against toxic gas concentrations or biological hazards that are beyond its designed capability. This limitation is crucial for users to understand, as it underscores the importance of selecting the right respiratory protection for specific scenarios and recognizing that APRs are not suitable for every situation or environment.

The other options discuss various attributes of APRs that are not accurate limitations. For example, APRs may be used in various temperatures, including cold environments, and they do not categorically require a full face shield for effectiveness, as they can come in different styles depending on their intended use. Understanding the limits of APRs ensures that personnel can make informed decisions about their safety equipment in hazardous situations.