Housing made of galvanized sheet steel with connection flange on both sides for installation in the duct. Lid can be opened or removed using quick-release fasteners to remove the filter. Pocket filter cassette on a supporting frame for high dust absorption, large-area dimension. Filter made of synthetic plastic, class F 7, DIN 53438 F1, self-extinguishing. Separation efficiency: approx. 98%, dust storage: 88.6 g/m². Can be installed in any position.