Suggested Division 15 Specification Architectural Diffusers Models: MB-30 - Supply - Uninsulated Square, architectural, panel faced ceiling diffusers shall be TITUS Model MB-30 (uninsulated) of the sizes and mounting types shown on the plans and outlet schedule. Diffuser shall be available in ¾- or 1-inch slot widths; one, two, three or four slots shall be available as standard. Diffuser shall be compatible with 24 x 24-inch modules for lay-in T-bar ceilings. Diffusers must be field adjustable for vertical, one-, two-way opposite, two-way corner, three-way and four-way discharge patterns. Fixed vane diffusers are not acceptable. Each supply slot of the diffuser shall be provided with a two-element, aerodynamically curved, “ice-tong” shaped steel deflector capable of 180° pattern adjustment from the face of the diffuser and shall allow volume dampering of supply air for final balancing. All adjustments shall be accessible from the face of the diffuser. The diffuser shall have an extruded aluminum face and factory fabricated 22-gauge steel backpan. The diffuser shall have the capacity to insert a ceiling tile into the center of the diffuser to match the ceiling system. The ceiling tile will be provided by the ceiling system contractor. The backpan shall be removable and shall include side handles. Diffuser shall have ¼-inch thick fiberglass internal insulation (MBI-30) when specified. The diffuser inlet shall be located on the top of the backpan and shall have a minimum of 1 1/8-inch depth available for duct connection. Optional damper shall be constructed of heavy gauge steel. The diffuser finish shall be #26 white and the pattern controllers shall be 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. The manufacturer shall provide published performance data for the architectural diffuser. The test data shall include static pressure drop, horizontal air throw pattern and NC. The diffusers shall be tested in accordance with ANSI/ASHRAE Standard 70-1991.