& nbsp; air filtration function: < br; style=" margin:0px; padding:0px; color:#333333; font-family:tahoma, Arial, sans-serif; font-size:14px; Tahoma, line-height:24px; " /> & nbsp; 1: to maintain the performance of quality conditions: A (high performance filter efficiency, air resistance situation) B performance is low; C long life (< br catch a lot of dust); style=" margin:0px; padding:0px; color:#333333; font-family:tahoma, Arial, sans-serif; font-size:14px; line-height,,:24px; " /> & nbsp; & nbsp; 2: has the quality conditions of durability, rationality: A pressure resistance, vibration resistance & nbsp; and high durability, will not be dust leakage B: low temperature resistance, high temperature resistance, water resistance, filter paper, adhesive, rubber is not easy to invade C: simple and light loading