LIFE SAFETY SYSTEM

safety features for portable propane heaters in the nature of detection systems specially adapted for propane heaters for detecting the presence of oxygen depletion and heater position, sold as a component of propane heaters; safety features for portable propane heaters in the nature of oxygen depletion sensors, tip-switches, cross-thread protection system to prevent unintended sparking, and flame-retardant materials of the propane heater, sold as a component of propane heaters