Filter for disc valves with nominal diameter 100 mm to 200 mm Synthetic filter fleece according to EN 779 class G3 For extract air, protects the duct system from contamination Can also be used for supply air For air conditioning and ventilation systems, V max 8 m/s Installation: Insert the filter through the mounting frame and allow it to protrude approx. 1 cm from the frame. Screw the disc valve into the mounting frame. Maintenance: Depending on the room air pollution, the filter must be checked every 3-6 months and replaced if necessary. The disc valve is NOT included in the scope of delivery!