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Zehnder Filter set 2x Coarse 60% (G4) for ComfoSpot 50 705 613 125 204x60mm x 500mm Long Duct 204x60mm x 500mm Long Duct Silencer the Unohab units change between supply air and extract air mode Coarse refers to particles 10 micron Coarse 60% means that at least 60% of particles in the size interval 10 micron are removed
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