The 4-inch PerfectPleatÂ® pleated filter places a DuraFlexÂ® media pack inside a two-piece frame. Straps are added to the air-entering side of the filter to help maintain pleat spacing, while the pleat spacers are inserted in multiple rows on the air-leaving side. The pleat spacers assist in keeping pleats open during use, maximizing filter life, the company says. The two-piece frame is assembled around the rigid media pack and is bonded at all contact points with adhesives that ensure resistance to moisture, states the manufacturer. Both the Standard and HC (high capacity) Models are rated MERV 7. Standard 4-inch PerfectPleat has nine pleats per foot (PPF), and the HC Model has 11 PPF.
AAF International, P.O. Box 35690, Louisville, KY 40232-5690; 502-637-0326; 502-637-0460 (fax); www.aafintl.com.