Volume Damper Low-Leak OBD 3000-0BDLL-68X46 Step Down Ceiling Diffuser 104 - four way *

104 - four way * 2x2 galvaneal steel panel with seismic support holes * Square to round No Labor Collar * Soft White Options * 104 D - steel multi-shutter damper * 104 O - steel opposed blade damper * 104 FR

For damper free area chart B click here * 2565 - Round fire door for vertical mount only

Installation Instructions * UL approved installation instructions

Minimum size is 4"x4"

Hinged removable extruded aluminum face frame with signature line marks

Volume Damper Low-Leak OBD 3000-0BDLL-68X46 Step Down Ceiling Diffuser 104 - four way *h3. 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.