Disclosed herein is an apparatus and method for supporting a flexible duct. The apparatus comprises a concave duct support structure with a convoluted anterior end and one or more straps. The concave duct support structure is placed in contact with outer surface of the flexible duct. The convoluted anterior end supports curved surfaces of the flexible duct. The concave duct support structure comprises multiple slits. The straps pass through the slits of the concave duct support structure. Distal ends of the straps may be affixed to a structural member for suspending the flexible duct supported on the concave duct support structure. The concave duct support structure prevents the flexible duct from sagging and crimping, thereby allowing free flow of air, liquids, etc. through the flexible duct.