The 0800 Series is on the market in two body kinds to be used with steel duct: a double flange screw hole mounting style (M1) or perhaps a knock-in excess of tab style (M2). Both variations come with a straightforward set up Slice-out template which makes the oval condition openings https://dampers-for-industrial-se24556.actoblog.com/37674956/5-simple-techniques-for-dampers-for-industrial-sector