Model D0110DOW, D0120DOW, D0110GOW, D0120GOW are "from wall or floor" integral sleeve dynamic curtain form fire dampers. Design D0110GOW and D0120GOW are made for provide or return ducts that terminate at a grille or register. Product D0110DOW and D0120DOW are suitable for through penetrations (ductwork linked to either side) where by https://heavy-duty-stainless-stee91123.mdkblog.com/42811569/the-fact-about-dampers-for-industrial-sector-that-no-one-is-suggesting