Suggested Division 15 Specifications Heavy Duty Bar Return Grille Model: 30R 30R • 3/8-inch Spacing, 0° Deflection Steel return bar grilles shall be TITUS Model 30R (3/8-inch bar spacing and 0° deflection) for the sizes and mounting types as shown on the plans and outlet schedule. The fixed deflection bars shall be available parallel to the long or short dimension of the grille. Construction shall be of steel with a 1¼-inch border width on all sides and a minimum border gauge thickness of 16; bars shall be 14-gauge steel. Bars shall be reinforced by perpendicular, steel support bars spaced on 6-inch maximum centers. Corners shall be welded with full penetration resistance welds with a reinforcing patch for extra strength. Screw holes shall be countersunk for a neat appearance. Optional opposed-blade volume damper shall be constructed of heavy gauge steel. Damper must be operable from the face of the grille. 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.