General description The vhbw conical filters are designed for use with geothermal heat exchangers, specifically the Vallox GEO Außenluft model. These exhaust air filters help prevent contamination in ventilation ducts and ensure quiet operation of exhaust air valves. Technical specifications Filter class: G3 Length: 50 cm Width: 29.5 cm Thickness: 1 cm Material: fleece Colour: white Weight: 125 g Binder-free, thermally bonded Compatibility and accessories Compatible with Vallox GEO Außenluft Replacement for models 1765 and 394302 Installation Fits on all round exhaust air disc valves with mounting ring Valves must be screwed into the mounting frame/mounting ring using a quarter turn Usage Prevents contamination of ventilation ducts Ensures quiet operation of exhaust air valves