Suggested Division 15 Specifications Square Ceiling Diffusers Round Neck Model: TMS - AA - Aluminum Square ceiling diffusers shall be TITUS Model TMS-AA (aluminum with steel support bar) of the sizes and mounting types shown on the plans and outlet schedule. The TMS-AA shall have three cones, which give a uniform face size and appearance when different neck sizes are used in the same area. All cones shall be one piece precision die-stamped; the back cone shall also include an integrally drawn inlet (welded-in inlets and corner joints are not acceptable). The two inner cones shall be constructed as a single, removable inner cone assembly for easy installation and cleaning. The inner cone assembly must have a hole with removable plug in the center to allow quick adjustment of an optional inlet damper without removing the inner cone assembly. Diffusers shall be constructed of 0.040 aluminum. 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 round damper shall be constructed of heavy gauge steel. Damper must be operable from the face of the diffuser. Optional sectorizing baffles shall be available to restrict the discharge air in certain directions. Optional molded insulation blanket shall be available. The insulation will be R-6, foil-backed and provided an additional 1-inch gap around the neck to install insulated flex duct. The manufacturer shall provide published performance data for the square diffuser. The diffuser shall be tested in accordance with ANSI/ASHRAE Standard 70-1991.