Model D0110DOW, D0120DOW, D0110GOW, D0120GOW are "out of wall or ground" integral sleeve dynamic curtain form fire dampers. Product D0110GOW and D0120GOW are created for supply or return ducts that terminate in a grille or register. Product D0110DOW and D0120DOW are made for through penetrations (ductwork linked to either side) the https://donovanhyncq.blog2freedom.com/37087063/little-known-facts-about-heavy-duty-stainless-steel-damper-manufacturers