Model D0110DOW, D0120DOW, D0110GOW, D0120GOW are "from wall or floor" integral sleeve dynamic curtain style hearth dampers. Model D0110GOW and D0120GOW are suitable for provide or return ducts that terminate in a grille or sign-up. Model D0110DOW and D0120DOW are created for by means of penetrations (ductwork linked to each side) https://heavy-duty-stainless-stee46788.blogvivi.com/37630772/considerations-to-know-about-heavy-duty-stainless-steel-damper-manufacturers