Grease filters should be replaced regularlyAs the filters trap the grease from the air they will become blocked over timeIf the filters are filled with greasy residue your cooker hood won\'t work as efficientlyPlease check below for the list of compatible cooker hoodsImage for illustration purposes only Grease filter for 60cm electriQ Chimney Hoods 2 required for . eiQCHIM60SC eiQCHIM60BL . and 1 required 70cm electriQ Curved Glass Chimney Hoods . eiQCURV70SC eiQCURV70BL . .