Versions 0110DOW, 0120DOW, 0110GOW and 0120GOW are "from wall or flooring" integral sleeve static curtain sort fire dampers.  Product 0110GOW and 0120GOW are specially suitable for source or return ducts that terminate in a grille or sign up. Design 0110DOW and 0120DOW are suitable for via penetrations (ductwork linked to https://dampers-for-industrial-se35677.blogocial.com/dampers-for-industrial-sector-an-overview-72786947