Volume Damper Low-Leak OBD 3000-0BDLL-64X20 T-Bar Extruded aluminum surface mount frame

Extruded aluminum surface mount frame with signature line marks

904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 4" Duct Opening  (front blades parallel to shortest dimension)

Standard Features * Universal Collars for T-bar supply and returns * Soft White Finish * Available for 6" to 14" round duct in 1" increments

3-way register with stiffened 1/2" fan shaped louvers for silent operation

60% free area * Soft White Options * Countersunk screwholes with matching Phillips #8 x 1-1/2" oval Screws * 10 or 12 gauge steel * Tamper proof screws

Volume Damper Low-Leak OBD 3000-0BDLL-64X20 T-Bar Extruded aluminum surface mount frameh3. 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.