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Adjustable aluminum airfoil blades oriented for 1 or 2 way airflow pattern
904 - Double Deflection Adjustable Aluminum Blade Grille For a 48" x 20" Duct Opening (front blades parallel to shortest dimension)
Allows for 4-way airflow adjustment
Available in 6”–12” collar sizes
Double deflection radius mount spiral pipe grille with adjustable blades
Volume Damper Low-Leak OBD 3000-0BDLL-50X24 Step Down Ceiling Diffuser Adjustable aluminum airfoil blades orientedh3. 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.
