This steel flange includes screws and sealing tape for installation. Flange easily installs to to the filter by fastening the foam gasket tape to the underside of the flange to hold in place and then securing the flange in place with the 6 included scews. Be sure not to torque the screws too much as air will pass through any gaps and prevent a tight seal. Use this flange to connect your Can Filter to you Can Fan or to ducting for your needs. (Filters sold separately).