4" Round Vertical Mount Fire Damper 2649-6 Step Down Ceiling Diffuser SD34 - Transition Box Spiral

SD34 - Transition Box Spiral Pipe Grille (DOUBle Deflection)

Galvanized Finish

Air Patterns

RS52 Series Engineering/Performance Data

Airfoil blades individually adjustable on 3/4" centers

4" Round Vertical Mount Fire Damper 2649-6 Step Down Ceiling Diffuser SD34 - Transition Box Spiralh3. 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