Product D0110DOW, D0120DOW, D0110GOW, D0120GOW are "out of wall or ground" integral sleeve dynamic curtain sort fireplace dampers. Design D0110GOW and D0120GOW are designed for offer or return ducts that terminate at a grille or register. Design D0110DOW and D0120DOW are made for by way of penetrations (ductwork connected to either https://heavy-duty-stainless-stee67788.bloggazza.com/35836396/the-basic-principles-of-dampers-for-industrial-sector