The OPTREL COMPACT AIR breathing system can easily and confortably be carried. The seperation of the blower and the battery compartment results in an ideal balance of weight on the ergonomic belt, which is delivered together with the breathing system. The OPTREL AIRBELT unit allows to breath without resistance. This is achieved by a surplus of clean and filtered air. An adult needs an airflow of approx. 50 lt/min whereas the Airbelt system puts 160 lt/min at your disposal. The excess airflow provides an additional protection due to a small overpressure within the helmet. The COMPRESSED AIR is a master-piece of design and user friendly. The airflow is easily and effectively regulated by turning a robust plastic ring on the connection tube.