The 0800 Collection is available in two body styles to be used with steel duct: a double flange screw gap mounting form (M1) or simply a knock-over tab type (M2). Both of those styles include a simple set up Minimize-out template which makes the oval condition openings further very easy https://riverizpdq.prublogger.com/35913452/detailed-notes-on-heavy-duty-stainless-steel-damper-manufacturers