Products Home/Dampers/Volume Control Damper 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 Volume control damper is made of galvanized steel body with aluminum blades. The above photo shows the design for a customer and cannot be sold to every one.