A projector's air filter prevents dust from accumulating on the optical elements inside the projector. If you are replacing your lamp, it is a good time to replace your filter. Manufacturers' suggest replacing the filter when changing the lamp to ensure optimal performance. The ET-RFV300 filter is compatible with the PANASONIC PT-VW345NZ, PT-VW340Z, PT-VW340ZU, PT-VW340ZE, PT-VW345NZ, PT-VW350, PT-VW350E, PT-VW350U, PT-VW355N, PT-VW355NU, PT-VW355NE, PT-VW360, PT-VX410Z, PT-VX410ZU, PT-VX410ZE, PT-VX415NZ, PT-VX415NZU, PT-VX415NZE, PT-VX420, PT-VX420E, PT-VX420U, PT-VX425N, PT-VX425NE, PT-VX425NU, PT-VX42Z, PT-VX42ZU, PT-VX42ZE, PT-VX430, PT-VW340Z, PT-VX415NZ, PT-VX410Z, PT-VX42Z, PT-VW340ZU, PT-VW345NZU, PT-VW350U, PT-VW355NU, PT-VX420U, PT-VX425NU, PT-VW360U, PT-VX430U projectors.