vhbw - the clever way conical filter for your ventilation system The exhaust air filter from vhbw prevents contamination of the ventilation ducts in the exhaust air area and guarantees very quiet operation of the exhaust air valves. The cone filter fits on all round exhaust air disc valves with mounting ring with a diameter of 12.5 cm (DN 125) when the valves are screwed into the mounting frame / mounting ring using a quarter turn. CONTENT OF DELIVERY: - 10x exhaust air filter (conical filter) TECHNICAL DETAILS: - 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 Compatible with Zehnder STB 125 Replacement for Zehnder 990320032 vhbw - High-quality replacement parts and accessories to prolong the service life of your electronic devices.