These extruded Aluminium Grilles are suitable for Return and Exhaust Air. Constructed from aluminium, the louvres have half chevron blades and are suitable for various exhaust air applications. If you are need a half chevron louvre, you will discover a wide range here. Check out our high-performance half chevron grilles today. Suited to Wall mountings, these Grilles can also be customized to size, colour, core type or type of blade.