Products 0110DOW, 0120DOW, 0110GOW and 0120GOW are "from wall or ground" integral sleeve static curtain sort fireplace dampers.  Model 0110GOW and 0120GOW are specially designed for offer or return ducts that terminate in a grille or register. Model 0110DOW and 0120DOW are created for through penetrations (ductwork connected to each https://rowanzqfsh.buyoutblog.com/36975993/considerations-to-know-about-heavy-duty-stainless-steel-damper-manufacturers