Ubbink’s renowned Air Excellent air distribution system is ductwork designed to distribute air for central mechanical ventilation systems with (and without) heat recovery used to ventilate residential and small commercial buildings. The Air Excellent system is semi-rigid ductwork in various circular and semi-circular variants and covers a very extensive portfolio of accessories, including 90˚ horizontal and vertical bends, connectors, seal-rings, valve adapters and much more. Part of the broad product range are the various distribution boxes and supply- and extract valves.