This elbow provides a method of diverting the 300mm duct system around objects. A cover (Part No: TC1279-305) is supplied. It can be used with a 300mm tee (Part No: TC1279-279A) to feed a duct at a 45-degree angle to the main system. The elbow can also be used in pairs to align ducts and other components with an offset. A slotless joiner (Part No: TC1279-287A) is used at each interface, to produce a smooth and strong joint. They are available separately.