... air pollution. Its frequently used in air purifiers, filters, air conditioners, fume purifier filter. V-shaped fold ... choosed: waterproof paper frame, galvanized iron, aluminum alloy, stainless steel. Panel filter / activated carbon / pre filter / framed filter / air ... frame, galvanized iron, aluminum alloy, stainless steel.Synthetic fiber combined with coco activated carbon.495*495*4610040295*495* ...