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