4" Round Vertical Mount Fire Damper 2649-20 T-Bar 1/2" spacing dual angular louvers

1/2" spacing dual angular louvers for strength and maximum free area

Hand operated level for easy filter access and cleaning

Insect Screen

904 - Double Deflection Adjustable Aluminum Blade Grille For a 22" x 18" Duct Opening (front blades parallel to shortest dimension)

Tool Operated Opposed Blade Damper

4" Round Vertical Mount Fire Damper 2649-20 T-Bar 1/2" spacing dual angular louversh3. 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