Large format circular diffusers suitable for low and medium pressure systems. Manufactured from mild steel. Capable of supplying large volumes of air. Commonly installed directly to exposed ductwork in open plan areas such as retail stores, halls, and arenas to give an industrial aesthetic. The diffusers will fit directly to spiral tube and flexible ducts. They can also be used with single blade damper units (a female coupler between diffuser and damper unit will be required).