Chief Medium Fusion Dynamic Height Adjustable Floor Support5. 75 (400 mm), 200 x 200 800 x 400 mm Ideal for interactive applications, Fusion mounts with dynamic height adjust capability create better accessibility to technology in the boardroom and the classroom. The height adjustable box provides ultra smooth and fast vertical travel with almost no effort. Easy to install. Easy to adjust. This solution is especially helpful for applications where the wall structure can't carry the weight. Height adjustable