This optional premium filter enhances air filtration when used with the standard filter. It provides improved particle capture with ratings up to MERV 6 and also helps to adsorb odors. The filter is designed for use with specific Friedrich Kuhl model window air conditioners. Highlights - Improves air quality by combining with standard filter - Provides odor adsorption Key Specs - Filtration rating up to MERV 6 - Compatible with Friedrich Kuhl SM model window air conditioners - Compatible with Friedrich Kuhl EM model window air conditioners - Compatible with Friedrich Kuhl YM model window air conditioners