Products Home/Dampers/Butterfly Dampers Product Categories Aluminium Eggcrates Ceiling Diffusers Grilles Swirls Linears Jet Diffusers Floor Diffusers Weather Louvres Plastic Grilles Supply Air and Plenums Fire Damper Dampers Zoning Accessories Butterfly dampers are made from galvanized steel. Sizes available: D150 (6″) D200 (8″) D250 (10″) D300 (12″) D350 (14″) D400 (16″) Standard colour: Beige