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Filter F9 Vitovent 300 (300 400 m³ h) Zuluft Produced Filter F7 for Geothermal heat Santos (F) 370 570 DC Filter F7 for Geothermal heat exchangerZehnder ComfoFond L 300 600 filters out up to 70% of fine dust Nanofilter F9 for ventilation unit Stiebel Eltron LWZ 504 LWZ 604 air filters out up to 85 % of fine dust Supply air filter F9 for ventilation device Viessmann Vitovent 300 (300 400 m³ h) separates up to 85% of fine dust
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