MSA OptimAir® TL Powered Air Purifying Respirator Kit The low-profile OptimAir® TL Powered Air-Purifying Respirator combines state-of-the-art design with superior "smart" features. The unit packages the motor blower, cartridges, and battery in a single hip-hugging design for lightweight comfort and fit. The low profile motor blower offers optimal airflow through a crushproof breathing tube, while the ergonomic battery pack allows for free movement within confined spaces. The unit automatically adjusts flow rates for altitude via an internal pressure sensor, while the cutting-edge design permits fast, accurate change-out of cartridges, hoods and batteries. The standard kit includes motor blower, smart charger, standard battery, hose, and decon belt.