Replacement filter cassettes for the supply air of integral devices made of shatter-proof polyester fibres with partially progressive construction, thermally bound, temperature-resistant up to 100 °C, Z-folded with side bonding with pull tab and U-shaped reinforcement of the front sides. Technical data: application: ventilation units, filter class: F7, filter class: ePM1 >= 50% (F7), height: 372 mm, width: 184 mm, depth: 24 mm