Styles 0110DOW, 0120DOW, 0110GOW and 0120GOW are "away from wall or flooring" integral sleeve static curtain form fire dampers.  Design 0110GOW and 0120GOW are particularly suitable for supply or return ducts that terminate at a grille or register. Product 0110DOW and 0120DOW are suitable for by penetrations (ductwork connected to https://heavy-duty-stainless-stee56788.iyublog.com/36052103/the-2-minute-rule-for-heavy-duty-stainless-steel-damper-manufacturers