The ETEMF100 Projector Air Filter is a replacement filter for the Panasonic PTFW430E, PTFX400E, PTFW430U, PTFW430EA, PTFX400EA and PTFX400U projectors. The filter traps outside pollutants on its surface, allowing your projector to keep running smoothly. Dust is kept from entering the projector and slowing down operation or damaging your investment.