Profile: Woodwaste Control (Eng) Ltd. supplies ducting, wood-fired heaters, chippers, shredders, briquettors, rotary valves and used machinery. The AZR 60 - 600s chipper series are small but powerful machines, ideal for small to medium sized companies. The AZR 800 - 2000s are a series of extremely big, powerful chippers with a choice of eight different machine types, sizes and size reduction techniques. We also offer ducting. Clip duct is designed to help air flow by decreasing the amount of internal protrusion. The ductwork is also easy to fit and modify using quick clamps.