Versions 0110DOW, 0120DOW, 0110GOW and 0120GOW are "away from wall or ground" integral sleeve static curtain kind fire dampers.  Product 0110GOW and 0120GOW are especially made for source or return ducts that terminate in a grille or sign-up. Model 0110DOW and 0120DOW are suitable for by way of penetrations (ductwork https://heavydutystainlesssteelda68890.blog-mall.com/37577550/how-dampers-for-industrial-sector-can-save-you-time-stress-and-money