The 0800 Series is available in two frame styles to be used with steel duct: a double flange screw gap mounting variety (M1) or perhaps a knock-above tab sort (M2). The two variations feature a straightforward set up Minimize-out template which makes the oval condition openings further simple to Reduce. https://heavydutystainlesssteelda90123.blogocial.com/the-5-second-trick-for-dampers-for-industrial-sector-72649792