The Cobra-Jet filter is cleaned by compressed air. It is used for very aggressive types of dust, in order to prevent rapid wear of the filter cloth. As an investment the Cobra-Jet filter, is more expensive than a Pat-Jet, but even after changing the filter cloth apr. 3 times, a bag type filter such as the Cobra-Jet is more economical even taking maintenance costs into consideration.
眼鏡蛇式除塵用壓縮空氣清洗。它是用于非常積極的類型的粉塵，為了防止濾布磨損快。作為一種投資眼鏡蛇式除塵，比拍飛機更昂貴，但即使在更換過濾布四月三日倍，袋式過濾器如眼鏡蛇噴射是更經濟，甚至以維護成本考慮。