The 880 Series Round Commercial Diffusers are step-down ringed diffusers which are used to cover duct openings. Our product is constructed to ensure maximum airflow and the simple design will ensure that this duct diffuser streams air directly into your room. Made of high quality steel with a white powder coat finish each of our step down diffuser rings deflect the air stream 360 deg. TRUaire™ Step-Down Supply Diffuser, 3-Cone, Series: 880, 16 in, Round Diffuser Shape, 4-1/2 in D, 360 deg Diffusion Pattern, Pristine White, Steel, Powder Coated, Import