Duo-Pak 40 filters are designed for applications requiring long service life with medium efficiency filtration.

The Duo-Pak 40 2-ply configuration utilizes progressive density 550 media, providing high dust holding capacity and improved efficiency. A specially formulated tackifier prevents particle migration and enhances filtration effectiveness, especially for particles above five microns.

The 1-ply configuration uses a tackified single-density polyester media, offering an economical option for applications requiring high dust holding capacity in a primary filter.

The self-sealing design eliminates air bypass and removes the need for clips or fasteners, reducing installation time and maintenance costs.

With its long service life and cost efficiency, the Duo-Pak 40 is an ideal replacement for four-inch or six-inch pleated filters in systems using holding frames or flat bank side-access housings.