General description The vhbw conical filters are designed for use with geothermal heat exchangers, specifically as exhaust air filters. They effectively prevent contamination in the 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 Replacement for Vallox 1765 and 394302 Fits all round exhaust air disc valves with mounting ring Usage Designed for use in geothermal heat exchangers Ensures quiet operation of exhaust air valves