What is one of the primary limitations of Air Purifying Respirators (APRs)?

One of the primary limitations of Air Purifying Respirators (APRs) is the limited life of filters or canisters. Aprs rely on filters or chemical cartridges to remove contaminants from the air before they are inhaled. Over time, these filters or canisters become saturated or clogged, which reduces their effectiveness and can lead to a buildup of harmful substances. As such, users must monitor the condition of these components and replace them as necessary. This limitation means that while APRs can be effective in certain environments, they may not provide adequate protection in situations where prolonged exposure to hazardous materials is anticipated or if the filters/ canisters are not changed promptly.

The other options, while they might present challenges in specific circumstances, do not reflect the fundamental operational limitation posed by APRs in a way that the life span of filters does, as this directly impacts the respirator's functional safety.