Visit PTAC Solutions for American Air Filters, Dust Collectors, Air Pollution Control Equipment and other types of Air Filtration. We offer a Full Line of Replacement and Custom Made Air Conditioning Filters for both Residential and Commercial Air Filter Systems. Designed for general air filtration applications with light to medium dust loading conditions, StrataDensity disposable panel filters are engineered for sturdy, economical performance and ease of use. This filter model is constructed with a strong, chipboard frame bonded to AAF manufactured premium grade fiberglass media. With new technology, the double-skinned media design eliminates the need for scrim or metal retainers by building the strength requirements into the fiberglass. Dense, compression resistant fibers also contribute to making the StrataDensity filter superior and long-lasting. Available in a wide range of sizes, StrataDensity filters are used in all types of HVAC systems to protect the coils from dirt. They are also used as prefilters to extend the life of higher efficiency filters.