Suggested Division 15 Specifications Eggcrate Return Grille Model: 50R-SS 50R-SS • Stainless Steel Grid • Stainless Steel Border Return grilles shall be TITUS Model 50R-SS for sizes and mounting types as shown on the plans and outlet schedule. Return grilles must provide a free area of at least 90%. Outer borders shall be 304 Stainless Steel. Screw holes shall be countersunk for a neat appearance. Border width shall be 1 3/8 inches on all sides and shall be interlocked at the four corners and mechanically staked to form a rigid frame. The stainless steel grid is ½ x ½ x ½-inch. Optional opposed-blade volume damper shall be constructed of heavy gauge steel, aluminum or 304 stainless steel. Damper must be operable from the face of the grille.