Duo-Pak 40™ Extended Surface Self-Seal Two Pocket Filter S KOCH FILTERPURE PERFORMANCE Duo-Pak 40 filters are designed for applications where long service life with a medium efficiency filter is required. The Duo-Pak 40, 2 ply configuration, with the benefits of the depthloading characteristics of 550 media, offers high dust holding capacity and efficiency. The progressive density design of the 550 media is enhanced with a specially formulated tackifier to prevent particle migration and provide exceptional efficiency above five microns. The Duo-Pak 40, 1 ply configuration, which utilizes a tackified single density polyester media, offers an economical alternative for applications where high dust holding capacity in a primary filter is required. The self-sealing feature of the Duo-Pak 40 prevents air bypass and eliminates the need for clips; saving time and money during change-outs. The longer service life and low cost make the Duo-Pak 40 an ideal replacement for four-inch, or six-inch pleat applications where holding frames, or flat bank side access housings are in use. E KOCH FILTER' PURE PERFORMANCE 8401 Air Commerce Drive, Louisville, KY 40219 toll free: 800.757.5624 | phone: 502.634.4796 | Fax: 502.969.2364 [email protected] | www.kochfilter.com