Products Home/Products/Accessories/Manual Damper Blade 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 Manual damper blade is made of quality 0.6mm galvanized steel with kwiki kit. Sizes available: D150 D200 D250 D300 D350 D400 D450