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An H20 beam is a structural timber beam commonly used in construction, particularly in formwork systems for concrete structures. It is shaped like the letter "H" and typically made of high-quality wood such as pine or spruce, with the web made of waterproof plywood or OSB. The beam is lightweight, strong, and durable, with excellent load-bearing capacity and resistance to bending. Its standard height is 200mm, and it is available in various lengths to suit different construction requirements.