Product D0110DOW, D0120DOW, D0110GOW, D0120GOW are "out of wall or floor" integral sleeve dynamic curtain variety hearth dampers. Model D0110GOW and D0120GOW are created for offer or return ducts that terminate in a grille or register. Design D0110DOW and D0120DOW are designed for by means of penetrations (ductwork linked to either https://shaneaqgti.ampedpages.com/little-known-facts-about-heavy-duty-stainless-steel-damper-manufacturers-63786754