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The Carrier/Midea/Lennox 12100204000397 replacement mini split filter is guaranteed to fit the following indoor units: Carrier 42QH/QS Models, INVERTER18CRFN1W, INVERTER18CRFN1W-INDOOR, INVERTER18CRSL1, INVERTER18CRSL1-INDOOR, INVERTER18CRWH1, MASAG1821HS2GA, MSMBC18CRDN1NC3G, MSMBC18CRDN1NC3G, MSMBC18HRDN1MN10W, MSMBC18HRDN1MN10W, PIA18264A, PIAW18099A, PIAW18099AS, PIAW18164A, PIAW18179A, PIAW18179A, and PIAW18179A.