Volume Damper Low-Leak OBD 3000-0BDLL-48X48 Step Down Ceiling Diffuser * Countersunk mounting holes for

* Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Driftwood Tan Options * TD Series - with damper

accepts 6"-16" collar (collar by others)

904 - Double Deflection Adjustable Aluminum Blade Grille For a 14" x 12" Duct Opening (front blades parallel to shortest dimension)

Front blades are parallel to the shortest dimension

Volume Damper Low-Leak OBD 3000-0BDLL-48X48 Step Down Ceiling Diffuser * Countersunk mounting holes forh3. 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.