This is a package of two replacement anti-allergy filters for Mitsubishi's MSY-A24 and MSZ-A24 wall mounted mini split indoor units. Product Features Enzyme Catalyst Mitsubishi's anti-allergy filters capture allergens and use an enzyme catalyst to break them down, cleaning your air as it passes through the mini split indoor unit. Product Includes (2) Anti-Allergy Filters Product Compatible With Mitsubishi MSY-A24 Mini Split Indoor Units Mitsubishi MSZ-A24 Mini Split Indoor Units