Parallel Blade Volume Damper 3000P-68X48 T-Bar For damper free area chart

For damper free area chart A click here * 2563 - Out-of-Airstream fire door

Galvanized Finish

Standard Features * Extruded aluminum construction with steel multi-shutter damper * Margin edges are 7/8" projection for baseboard installation * Nylon bushings for easy adjustment and quiet setting of airfoil blades running parallel to shortest dimension * Countersunk mounting holes for flush appearance

Adjustable steel curved blades

Rust resistant pre-coat with durable powder finish

Parallel Blade Volume Damper 3000P-68X48 T-Bar For damper free area charth3. Standard Features * 16 gauge galvanized channel frame * Parallel blades are cee stiffened 16 gauge galvanized for strength and stability * Blades pivot on non metallic celcon bushings * 1 2" square zinc plated steel pivot pins * 1 2" square zinc plated steel adjustable operating shaft extending up to 4" beyond the air control frame * Single blades on dampers with a height of 12" or less * Mill finish h3. Options * 3000 PLL Low Leak Air Control