Caryaire Exhaust valves are an effective and simple way to exhaust air in domestic and comfort ventilation applications. The Exhaust Valve has a convex valve disc and adjustment of air flow rate is achieved by rotating the valve disc. When the desired air flow rate is achieved the valve disc can be locked. These Exhaust valves are available in steel and aluminum construction and are powder coated. Sizes are 100,125,150 and 200mm Dia.