Genuine Mitsubishi MAC-408FT-E Replacement Filter for the following Mitsubishi Ductless Small Split Units: MSZ-GE06NA, MSZ-GE09NA, MSZ-GE12NA, MSZ-GE15NA, MSZ-GE18NA, MSY-GE09NA, MSY-GE12NA, MSL-GL15NA, MSY-GE15NA, MSY-GE15NA, MSY-GE18 NA Mitsubishi MAC-408FT-E, Enzyme Filter is a pack of two replacement filters for Mitsubishi Mr. Slim heat pump and air conditioning split systems. The original Mitsubishi OEM air filter is a blue enzyme filter that attaches to the pre-filter with plastic frame. The filter captures air particles and traps fine dust that the larger post-filter cannot catch. The Mitsubishi MAC-408FT-E air filter should be changed once every four months. Each pack contains 2 filters.