Volume Damper Low-Leak OBD 3000-0BDLL-50X24 Step Down Ceiling Diffuser 904 - Double Deflection Adjustable

904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 6" Duct Opening  (front blades parallel to shortest dimension)

Steel riveted and metal formed assembly

120x120 multiple

Double deflection radius mount spiral pipe grille with adjustable blades

Adjustable aluminum airfoil blades oriented for 1 or 2 way airflow pattern

Volume Damper Low-Leak OBD 3000-0BDLL-50X24 Step Down Ceiling Diffuser 904 - Double Deflection Adjustableh3. Standard Features * Opposed blade operation for precise volume control * 16 gauge galvanized channel frame * Blades are vee 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.