Suggested Division 15 Specifications 350 Series 304 Stainless Steel Return Grilles Model Description 350RLF1-SS 350RSF1-SS Stainless steel return grilles shall be TITUS Model 350R_F1-SS (3/4-inch blade spacing) of the sizes and mounting types shown on the plans and outlet schedule. The fixed deflection blades shall be available parallel to the long or short dimension of the grille. Construction shall be of 304 stainless steel with a 13/8-inch wide border on all sides. Screw holes shall be countersunk for a neat appearance. Corners shall be welded with full penetration resistance welds. Deflection blades shall be contoured to a specifically designed and tested cross-section to meet published test performance data. Blades shall be firmly held in place by mullions from behind the grille and fixed to the grille by welding in place. Blade deflection angle shall be 35° (Models 350R-SS and 355R-SS). 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. The grille finish shall be #04 mill. Grilles shall have a 1" filter frame. The manufacturer shall provide published performance data for the grille. The grille shall be tested in accordance with ANSI/ASHRAE Standard 70-1991.