Mitsubishi MAC-1500DF FITS IN----MSH09NV, MSH07NV, MSH12NV- DEODORIZING FILTER removes ammonia and hydrogen sulphide emitted from tobacco, and odors of pets. Clean DEODORIZING FILTER every two weeks. If the filter is particularly dirty, clean the filter more often. For cleaning, soak the filter in warm water for a while, and then wash and rinse it. Dry the filter in the shade thoroughly. When the filter color is still dark even after cleaning, replace the filter with a new one. Replace the filter at least once a year. DEODORIZING FILTER and AIR CLEANING FILTER can be attached on either side.