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parallel to longest dimension
Maximum dimension 60x60
904 - Double Deflection Adjustable Aluminum Blade Grille For a 30" x 30" Duct Opening (front blades parallel to shortest dimension)
Face set in an outer T-Bar filter grille frame
inner dimension and outer dimension sizes available * Tamper proof screws * Standard Color
Volume Damper Low-Leak OBD 3000-0BDLL-60X24 Step Down Ceiling Diffuser parallel to longest dimensionh3. 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.
