General description The vhbw conical filter is designed for ventilation systems, specifically to prevent contamination in the exhaust air ducts while ensuring quiet operation of exhaust air valves. This filter is a high-quality replacement for the Zehnder 990320031 model. Technical specifications Filter class: G4 Filter size: DN 100 Diameter: 10 cm Length: 17 cm Width: 18 cm Thickness: 0.86 cm Material: synthetic fibre Colour: white Binder-free, thermally bonded Compatibility and accessories Fits all round exhaust air disc valves with a mounting ring diameter of 10 cm (DN 100) Compatible with valves that are screwed into the mounting frame using a quarter turn Usage Designed for use in ventilation systems to maintain air quality Helps prolong the service life of electronic devices by preventing duct contamination