Design D0110DOW, D0120DOW, D0110GOW, D0120GOW are "away from wall or floor" integral sleeve dynamic curtain kind fire dampers. Design D0110GOW and D0120GOW are suitable for source or return ducts that terminate in a grille or register. Model D0110DOW and D0120DOW are designed for as a result of penetrations (ductwork linked to https://dampersforindustrialsecto90112.thenerdsblog.com/42814128/the-heavy-duty-stainless-steel-damper-manufacturers-diaries