Product D0110DOW, D0120DOW, D0110GOW, D0120GOW are "outside of wall or flooring" integral sleeve dynamic curtain sort fire dampers. Model D0110GOW and D0120GOW are designed for supply or return ducts that terminate in a grille or sign-up. Design D0110DOW and D0120DOW are made for by means of penetrations (ductwork linked to either https://heavydutystainlesssteelda12233.get-blogging.com/37570760/rumored-buzz-on-heavy-duty-stainless-steel-damper-manufacturers