1.G1 G2 G3 G4 2.DIN 53438-F1,UL900-class2 3.multilayer, 100 centigrade, moisture-proof 4.primary ... efficiency filter cotton G1 G2 G3 G4 DIN 53438-F1,UL900-class2 multilayer 100 centigrade, moisture-proof primary efficiency air ... -5002.0m*20m*25mm941.0/2.5452502000600100.C G1 G2 G3 G4 DIN 53438-F1,UL900-class2 multilayer 100 centigrade, moisture-proof ...