Round, adjustable ceiling diffuser with removable core and safety chain for all sizes greater than 12". The Round Cone Diffuser (RCD) combines the visual appeal of a round cone design with maximum air diffusion efficiency. The RCD offers adjustable airflow with a variety of different adjustment methods allowing for the perfect balance between performance and economy. Ideally suited to exposed duct applications, Round Cone Diffusers provide a strong horizontal pattern, even without a ceiling present. Easily adjustable to provide both horizontal and vertical air patterns, performance of the RCD can be maximized for both heating, and cooling applications. This product comes in the standard B12 white finish. Damper optional (view related products).