|Accumulair air filters consist of over 185+ sizes and are available in 1", 2", 4", and 6". In addition, Accumulair air filters can be custom made to your exact size! All Accumulair filters are pleated, 3-month, electrostatically charged filters that are great for capturing airborne allergens. Accumulair air filters are chemical free so you never have to worry about the addition of unnecessary chemicals to your air. Furthermore, Accumulair filter material is designed so that it will not support the development of mold, mildew, bacteria, or other microorganisms in normal use. So if you are looking for a way to help reduce airborne allergens such as bacteria, particles that carry viruses, pollen, mold spores, fine dust, and pet dander then an Accumulair air filter is for you! Accumulair...as essential as the air you breathe!