Opposed Blade Volume Damper 3000-0BD-66X58 T-Bar Standard collar diameter is the

Standard collar diameter is the same as the diffuser size

AA-HVL Series Engineering/Performance Data

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

Standard Features * Heavy duty honeycomb construction * Blades run parallel to longest dimension given * Gym Grade - includes welded core and extra supports for heavy duty application * Mounting holes for sidewall and ceiling application * Recessed screwdriver operated opposed blade damper to control air volume for positive balance of system * Soft White Options * No mounting holes * Tamper Proof Screws * Standard Color

904 - Double Deflection Adjustable Aluminum Blade Grille For a 30" x 12" Duct Opening (front blades parallel to shortest dimension)

Opposed Blade Volume Damper 3000-0BD-66X58 T-Bar Standard collar diameter is theh3. 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.