Suggested Division 15 Specification Round Ceiling Diffusers - Adjustable Model: V-1 - Vortex Diffuser Round ceiling diffusers shall be TITUS Model V-1 vortex diffusers of the sizes and mounting type shown on the plans and outlet schedule. The V-1 diffuser must have deflectors capable of generating a spiral airflow to force the jet to adhere to the curved face border and discharge evenly across the ceiling. Center deflector must be capable of creating a vertical discharge when needed. The diffuser shall be constructed of heavy gauge steel. The finish shall be #84 black. The finish shall be an anodic acrylic paint, baked at 315°F for 30 minutes. The pencil hardness must be HB to H. The paint must pass a 100-hour ASTM B117 Corrosive Environments Salt Spray Test without creepage, blistering or deterioration of film. The paint must pass a 250-hour ASTM D870 Water Immersion Test. The paint must also pass the ASTM D2794 Reverse Impact Cracking Test with a 50-inch pound force applied. Optional volume damper shall be constructed of heavy gauge steel. Damper must be adjustable from the face of the diffuser by opening the blank-off plate. The manufacturer shall provide published performance data for the round diffuser. The diffuser shall be tested in accordance with ANSI/ASHRAE Standard 70-1991.