GRILLS & REGISTERS Aerofoil louvers with 0 degree, 15 degree, 30 degree and 45 degree deflections. Suitable for side wall, floor, sill and ceiling mountings. TYPES Single deflection – Horizontal or vertical deflection.Double deflection – Front Horizontal / Vertical adjustable bars, Rear Horizontal / Vertical adjustable bars MATERIAL Extruded aluminum, mild steel or stainless steel. FINISH Powder coated, anodized, emulsion painted, primer coated.