Nysan aerofoil systems feature: Extruded Nysan aerofoil louvers go from 4 to 24 inches in width Fabricated Nysan louvers can be created at nearly any size Aerofoil composition is typically metal (aluminum or steel), but many other options exist, including glass and wood Nysan metal louvers typically have an anodized aluminum finish to ensure long product life and minimal maintenance. Other finishes include polyester powder coating and fluoropolymer painting. All resist damage due to sun or weather.