Products 0110DOW, 0120DOW, 0110GOW and 0120GOW are "from wall or ground" integral sleeve static curtain variety fireplace dampers.  Model 0110GOW and 0120GOW are precisely made for source or return ducts that terminate at a grille or sign-up. Product 0110DOW and 0120DOW are made for through penetrations (ductwork connected to each https://dantezrgwl.blogdiloz.com/35876676/considerations-to-know-about-heavy-duty-stainless-steel-damper-manufacturers