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Zehnder Filter set Coarse 60% (G4) + ePM1 50% (F7) for Comfoair 500 990 320 032 Positive Input Ventilation or PIV Positive Input Ventilation or PIV is a concept that delivers fresh filtered air into a home at a continuous rate With a compact design Coarse 60% and ePM1 50% are the names according to the new filter standard ISO 16890 Course refers to particles 10 micron
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