Parallel Volume Damper Low Leak 3000PLL-36X12 Smoke-Fire Damper accepts 6"-16" collar (collar by

accepts 6"-16" collar (collar by others)

back blades parallel to longest dimension

904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 8" Duct Opening   (front blades parallel to shortest dimension)

Mounting holes with color matching 2" baseboard Phillips screws

Adjustable modular cores with fixed curved blades

Parallel Volume Damper Low Leak 3000PLL-36X12 Smoke-Fire Damper accepts 6"-16" collar (collar byh3. 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