Our MERV 13, Ultimate Allergen Reducing air filters provide the best filtration available of your standard and premium pleated filters. The MERV 13 pleated air filter achieves a 95% efficiency rating and is suggested for residential and commercial spaces where Green Building Council LEED Credits are required. Typically used with higher velocity units, the Merv 13 is available in 1 inch , 2 inch and 4 inch depths in over 600 standard and special, custom, sizes.