Volume Damper Low-Leak OBD 3000-0BDLL-38X18 Specialty Products 57% free area * 1307:

57% free area * 1307: 13/16" lattice opening

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

904 Series Performance Data

055 T6 extruded aluminum frame * Hand operated lever for easy access * Concealed mounting holes * Filter door hinges parallel to longest side * Filter retainers * Removable face for easy cleaning * For 1" filter (not included) * Soft White Options * 600 2 FG - 2" filter spacing (filter not included) * 600 TFG - T-Bar mount * Standard Color

Volume Damper Low-Leak OBD 3000-0BDLL-38X18 Specialty Products 57% free area * 1307: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.