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Analogue filter kit for Zehnder ventilation unit: Cormfoair Q 350/450/600. Filter class EN779 standard: F7 + F7 Energy efficient. The new generation filter material with low resistance ensures lower energy consumption and extends the life of the filter by up to 25% (compared to previous generation filters). High filter efficiency - ePM1 65%! Premium analogue replacement filters: tested efficiency, certified quality and German filter materials. Tested to ISO16890 in an accredited laboratory in Germany. Made in the EU.