Products 0110DOW, 0120DOW, 0110GOW and 0120GOW are "from wall or flooring" integral sleeve static curtain style fire dampers.  Design 0110GOW and 0120GOW are precisely made for provide or return ducts that terminate in a grille or register. Design 0110DOW and 0120DOW are suitable for via penetrations (ductwork connected to either https://dampers-for-industrial-se12344.worldblogged.com/43155064/the-5-second-trick-for-dampers-for-industrial-sector