The 0800 Series is out there in two frame variations for use with steel duct: a double flange screw hole mounting form (M1) or maybe a knock-more than tab style (M2). Both of those types come with a simple set up Slash-out template which makes the oval shape openings more https://dampersforindustrialsecto67899.laowaiblog.com/35741794/helping-the-others-realize-the-advantages-of-heavy-duty-stainless-steel-damper-manufacturers