Parallel Volume Damper Low Leak 3000PLL-42X14 Step Down Ceiling Diffuser Designed for large volume air

Designed for large volume air delivery

904 - Double Deflection Adjustable Aluminum Blade Grille For a 30" x 12" Duct Opening (front blades parallel to shortest dimension)

Building materials rated 2 hours or less

Rust-resistant pre-coat with durable powder finish

Adjustable aluminum curved blades

Parallel Volume Damper Low Leak 3000PLL-42X14 Step Down Ceiling Diffuser Designed for large volume airh3. 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