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Surface mount fixed blade grille with airfoil blades at 0°
floors and partitions with fire resistance ratings of 2 hours or less (for ceiling application
with 53% free area
RS52 Series Engineering/Performance Data
4" Round Vertical Mount Fire Damper 2649-6 Step Down Ceiling Diffuser Surface mount fixed blade grilleh3. Standard Features * 2649 Round damper for vertical mount only. Available 4" thru 52" round. * 2650 Round spring actuated (6) damper for vertical or horizontal mount. Available 4" thru 52" round. * UL and California State Fire Marshall approved * 4 1 4" standard frame style * Interlocking steel roll formed blade (3) with roll formed frames (1) * Blade lock (5) * Damper manufactured from corrosion tested galvanized mild steel (G 90) * Self locking
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