Model D0110DOW, D0120DOW, D0110GOW, D0120GOW are "outside of wall or flooring" integral sleeve dynamic curtain type hearth dampers. Product D0110GOW and D0120GOW are created for provide or return ducts that terminate in a grille or register. Product D0110DOW and D0120DOW are made for through penetrations (ductwork linked to either side) the https://dampers-for-industrial-se90000.anchor-blog.com/17341096/top-latest-five-heavy-duty-stainless-steel-damper-manufacturers-urban-news