The 0800 Collection is out there in two body designs for use with steel duct: a double flange screw hole mounting variety (M1) or perhaps a knock-above tab variety (M2). Both of those models feature an easy installation cut-out template that makes the oval form openings added simple to Reduce. https://dampers-for-industrial-se03455.blogripley.com/37840307/the-definitive-guide-to-heavy-duty-stainless-steel-damper-manufacturers