Dundas Jafine's new and improved shatterproof universal air deflector helps keep air flow away from plants, furniture and drapery and features an innovative, under register installation tab design. No need for magnets or other fasteners. This air deflector is compatible with steel, brass, plastic, wood registers and more. And is suitable for floor, wall or ceiling installation. It is made from a high-quality, durable plastic that is guaranteed not to break or crack and extends from 7 to 14 in to accommodate various register sizes.