●Can choose a variety of colors;
●Low initial resistance; 
●One-time use, can not be recycled or reused; 
●Large filtration area, price concessions.
●Clean the system of clean room and air-conditioning of fresh air, pre-filtrate air, new vent, etc. 
●Central air-conditioning system primary filtration, air-conditioning purification equipment fresh air vent pre-filtration;
●Pre-filter of medium effect filter;
●Do the first level filtering in all filter systems.
●Filter Material: Polyester fiber filter cotton;  
●Support network: Galvanized folding nets, aluminum folding nets, stainless steel folding network;  
●Outer frame: High temperature waterproof hard paper frame; 
●Features: One-time use, price concessions, do not pollute the environment.