When constructing the Accumulair Diamond, even the smallest details are important for designing the best that Accumulair has to offer.FeaturesMERV 13 ratingElectrostatic filtrationMore than 30 times more efficient than regular fiberglass filtersFinish DiamondDimension 24 x 24 x 4 in. LEED, Leadership in Energy and Environmental Design, is an organization that rates projects delivering better environmental and health performance. Filter; Pack of 2.