Suggested Division 15 Specifications Square Ceiling Diffusers Modular Core Adjustable Model: MCD-AA - Aluminum Ceiling diffusers shall be TITUS Model MCD-AA (aluminum) modular core diffusers. The diffuser 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 at least a 1-inch depth for easy duct connection. The diffuser core shall consist of fixed louver directional modules, which can be easily repositioned without tools in the field for one-, two-, three- or four-way discharge. Each module shall be easily removable to adjust an optional damper in the neck of the diffuser. 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. The manufacturer shall provide published performance data for the modular core diffuser. The diffuser shall be tested in accordance with ANSI/ASHRAE Standard 70-1991.