... 3.Function: air filter 4.EN779 class:G2, G3,G4 2012 New Design air intake Panel Filter with carboard- Pre filter Application: Filter dust , pre-filter through air filter programType: ... aluminum net or stainless steel netEN779 class:G2, G3,G4,F5Average arrestance:84%-90%(ASHRAE52.1-1992)EUROVENT4/5 class ... -CXD-659529046850/170045/90F5 Frame:Media: carboard panel filter,booth filter,panel air filter