Suggested Division 15 Specification Perforated Ceiling Diffuser - Star Pattern Steel Model: PSS-DF - Supply, Drop Face Perforated ceiling diffusers shall be TITUS Model PSS-DF (steel, drop face, supply) star pattern diffuser. Diffusers shall have a perforated face with 3/16-inch diameter holes on ¼-inch staggered centers and no less than 51 percent free area. Perforated face shall be steel or aluminum according to the model selected. The backpan shall be one piece stamped heavy gauge steel of the sizes and mounting types shown on the plans and outlet schedule. The diffuser neck shall have 1 1/8-inch depth for easy duct connection. The diffusers shall be shipped from the factory set for a four-way star airflow pattern. The backpan of the diffuser shall be constructed with sheet metal screw locator dimples to allow field adjustment from a four-way side blow to a four-way corner blow airflow pattern. The diffuser shall be capable of being field adjusted to change the airflow pattern without a significant increase in pressure drop or sound level, and shall also be adjustable for vertical airflow. The star deflector shall be one piece construction and must be mounted on the neck of the diffuser (face mounted deflectors are not acceptable). The deflector shall include a center opening to allow access to an optional damper. The perforated face must be easily unlatchable from the backpan to facilitate opening of the face for deflector adjustment or to access an optional damper. The finish shall be #26 white. 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 damper shall be constructed of heavy gauge steel. Damper must be operable from the face of the diffuser by unlatching the diffuser face. The diffuser must be designed such that complete removal of the face is not required during damper adjustment. The manufacturer shall provide published performance data for the perforated diffuser. The diffuser shall be tested in accordance with ANSI/ASHRAE Standard 70-1991.