4" Round Horizontal/Vertical Fire Damper 2650-20 Smoke-Fire Damper 1” rim size (2” larger

1” rim size (2” larger than nominal duct size / order size)

955 Series Engineering/Performance Data

Building materials rated 3 hours or less

SD34 - Transition Box Spiral Pipe Grille (DOUBle Deflection)

4" Round Horizontal/Vertical Fire Damper 2650-20 Smoke-Fire Damper 1” rim size (2” largerh3. 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