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. 5700” filters are designed for general air filtration in various types of industrial and commercial HVAC systems. Suitable for installation where dust loading conditions are particularly heavy, “5700” filters also serve as excellent prefilters for higher efficiency filters. Heavy Duty Unitized Construction “5700” filters are built for long-lasting service life in operating conditions where dust loading is heavy. 1" and 2" filters are completely hand assembled with a heavy duty, chipboard frame bonded to metal retainers placed on both sides of a dense fiberglass media pad. For additional rigidity, a stiffener bar is bonded to the frame in the center of both sides of the filter. The entire assembly is secured by taping over the frame. An alternate 2" die-cut frame “5700” is also available for applications that do not require metal retainers. Two mating die-cut boxes are bonded together to form a double-wall construction, the media pad is sealed to the frame to prevent leakage. Media pad support retainers are bonded to the media on both sides to prevent pad slippage and increase dust holding capacity. The media is manufactured from a dense pad of continuous filament glass fibers with a yellow tint on the air leaving side.