Volume Damper Low-Leak OBD 3000-0BDLL-46X24 Step Down Ceiling Diffuser Spiral pipe diameter must be

Spiral pipe diameter must be 4” larger than Height of the duct opening

055 T6 aluminum surface mount return air grille * 0 fixed blades parallel to longest dimension * Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Soft White Options * 907 O - recessed screwdriver operated opposed blade damper * No Labor Collar (square sizes only) * 900 T - T-Bar mount * 905 HD - reinforced construction * 905 IS - insect screen * 1335-1338 Series - stainless steel version * Fractional

115T Series Submittal

Standard Features * 2633 - Square or rectangular out-of-airstream fire damper for vertical mount only

165° standard * All sizes utilize one main curtain stay * Galvanized finish h3

Volume Damper Low-Leak OBD 3000-0BDLL-46X24 Step Down Ceiling Diffuser Spiral pipe diameter must beh3. 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.