General description The vhbw conical filter is designed for use with the Zehnder STB 125 ventilation system. This exhaust air filter effectively prevents contamination in the ventilation ducts and ensures quiet operation of the exhaust air valves. Technical specifications Filter class: G4 Filter size: DN 125 Diameter: 12.5 cm Length: 18 cm Width: 18 cm Thickness: 0.8 cm Material: synthetic fibre Colour: white Binder-free, thermally bonded Compatibility and accessories Compatible with Zehnder STB 125 Replacement for Zehnder 990320032 Usage Fits all round exhaust air disc valves with a mounting ring diameter of 12.5 cm (DN 125) Installation requires a quarter turn to screw the valves into the mounting frame/mounting ring Other information Content of delivery: 100x exhaust air filter (conical filter)