中效箱式过滤器 用途：适用于空气过滤系统的中级过滤；高效过滤器的预过滤 Use ：Air filtration system for filtering the intermediate; efficient pre-filter filter 特性：阻力低，风量大，容尘量大，结构牢固 Feature：Low resistance to wind a large amount of large dust capacity, the structure of solid 材料及使用条件(Materials and conditions of use)