Changzhou Ouna  drying equipment Co., Ltd. for cyclic utilization of heat energy and has, and energy-saving advantages, but at the same time, due to the coating drying combustible components of volatile and accumulate more than minimum explosive concentration of combustible gas and air mixed together to form explosive mixtures, the risk of explosion. In recent years, China's hot air circulation oven equipment explosion occurred, to be more safe to use this equipment and technology, it is to be carried out safety improvement.