Design D0110DOW, D0120DOW, D0110GOW, D0120GOW are "out of wall or flooring" integral sleeve dynamic curtain kind fire dampers. Design D0110GOW and D0120GOW are suitable for source or return ducts that terminate at a grille or sign up. Product D0110DOW and D0120DOW are made for by means of penetrations (ductwork connected to https://edgarkznbo.bloggerchest.com/37030498/the-basic-principles-of-dampers-for-industrial-sector