... the air handling or air condition system.Type:Pocket Filter Synthetic used for pre-filtration: G2, G3 & ... F6, F7, F8, F9Kind of pocket filter media:Washable pocket filter synthetic: G2, G3, G4, F5 Fire-retardant pocket filter synthetic: G2, G3, G4, ... F5, F6, F7, F8, F9Temperature resistance is 100 degrees centigrade Pocket Filter Synthetic