Round Supply Ceiling Diffuser - DCCA For the Aluminum version, please contact us for a quote. Click here for SUBMITTAL DCC Round diuser of multiple rings with a 360° xed pattern of air supply, round neck, and optional volume control. It's round neck is tall enough to install directly with flexible duct or spiro duct without the need to buy and install an additional connector. Provides aesthetics and it is ideal for low air volume. The nominal available diameters are 6” to 14” in increments of 2”. Materials:Manufactured in steel model DCCA and aluminum model DCCL.Finish:Baked electrostatic Paint Bright White (standard). (With options in other colors)Applications:An excellent choice for applications where aesthetics is the main element, such as office buildings, restaurants, department stores, etc.Sizes:Available diameters are 6” to 14” in increments of 2”.