Design D0110DOW, D0120DOW, D0110GOW, D0120GOW are "out of wall or flooring" integral sleeve dynamic curtain kind fireplace dampers. Model D0110GOW and D0120GOW are created for supply or return ducts that terminate in a grille or register. Model D0110DOW and D0120DOW are suitable for through penetrations (ductwork linked to both sides) where https://raymondoesgt.estate-blog.com/36048390/5-easy-facts-about-dampers-for-industrial-sector-described