Abstract: Various embodiments are directed to a lifeline apparatus and method of using the same. In various embodiments, the lifeline apparatus comprises a spool lock assembly selectively configurable between a locked configuration and an unlocked configuration to facilitate selective deployment of a lifeline from within a housing, the spool lock assembly comprising: a latch plate configurable between a nominal position and an actuated position; a lock arm engaged with the latch plate and configured for arrangement between engaged and disengaged positions based on a latch plate position, wherein the engaged position of the lock arm is defined the lock arm being positioned to prevent the selective deployment of the lifeline by restricting rotation of one or more components operatively connected to the lifeline; wherein the configuration of the spool lock assembly between the locked and unlocked configurations is defined by the latch plate position between the nominal and actuated positions.

Abstract: Systems, apparatuses, and methods for reducing temperatures of purified air from air-purifying respirators are provided.