Models 0110DOW, 0120DOW, 0110GOW and 0120GOW are "from wall or ground" integral sleeve static curtain kind hearth dampers.  Product 0110GOW and 0120GOW are especially suitable for supply or return ducts that terminate in a grille or sign up. Product 0110DOW and 0120DOW are created for via penetrations (ductwork connected to https://dampers-for-industrial-se35677.blogocial.com/dampers-for-industrial-sector-an-overview-72786947