Products Home/Products/Round Weather Louvre 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 Round weather louvre is made of spun alunimum with galvanized mesh on the back. Size available:D150D200D250D300D350D400D450Standard colour: natural anodising, powder coating in RAL9010 and RAL9016.