Factory Sectional Door Projects Sectional Doors for a Machinery Assembly Hall China Project reference: Sectional Doors for a Machinery Assembly Hall. Customer Challenge A machinery builder needed wide, tall doors for moving assembled machine frames in and out. Our Solution We engineered four vertical lift sectional doors with 8 m clear width and reinforced shafts sized for the extra door weight. Results Oversized frames now leave the hall without dismantling, cutting handling time and crane cost per shipment.