Design D0110DOW, D0120DOW, D0110GOW, D0120GOW are "from wall or floor" integral sleeve dynamic curtain type fire dampers. Product D0110GOW and D0120GOW are created for supply or return ducts that terminate in a grille or register. Product D0110DOW and D0120DOW are made for via penetrations (ductwork linked to both sides) where the https://josuecsfth.ssnblog.com/35956185/everything-about-heavy-duty-stainless-steel-damper-manufacturers