Parallel Volume Damper Low Leak 3000PLL-66X44 Smoke-Fire Damper 904 - Double Deflection Adjustable

904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 12" Duct Opening (front blades parallel to shortest dimension)

3/16” crossbars

22 gauge steel blades with an insulated blanket

Available 4" thru 28" round

Parallel Volume Damper Low Leak 3000PLL-66X44 Smoke-Fire Damper 904 - Double Deflection Adjustableh3. 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