What is a key factor when donning a PBE?

The key factor regarding the donning of a Portable Breathing Equipment (PBE) is that it should be done within 15 minutes. This time frame is crucial because the PBE is designed to provide protection against smoke and toxic fumes, which can become more hazardous the longer one waits to don the equipment in an emergency situation. By ensuring that the equipment is worn within this specified time limit, users can maximize their safety and effectiveness in mitigating the impact of hazardous environments.

In emergency protocols, timing can be critical for both personal safety and overall effectiveness in emergency response. Therefore, the 15-minute guideline serves as an essential training point for ensuring that responders are adequately equipped to handle an emergency promptly. Other options either suggest incorrect time limits or conditions that aren't necessary for the effective use of PBE.