Suggested Division 15 Specifications Maximum Security Grilles and Registers Model: SG-PR - Steel, Round Perforated SG-PR • Steel Round Perforated Face Maximum security grilles shall be TITUS Model SG-PR of the sizes and mounting type shown on the plans and outlet schedule. Grilles shall have a 3/16-inch thick steel face with 5/16 -inch diameter holes on 7/16-inch staggered centers. The sleeve shall be 3/16-inch thick and shall be stitch welded to the face and along the entire length of all sleeve seams. Optional opposed-blade volume damper shall be constructed of heavy gauge steel or aluminum. Damper must be operated from the face of the grille or rear operated. The grille 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. The manufacturer shall provide published performance data for the grille. The grille shall be tested in accordance with ANSI/ASHRAE Standard 70-1991.