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Ships within 48 hours · Estimated delivery Nov 16 - Nov 21
Square collar designed for 20” × 20” duct
Margin edges are 7/8" projection for baseboard installation
1 1/2 hour fire resistance rating
Adjustable steel roll formed blades oriented for 1 or 2 way airflow pattern
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
Volume Damper Low-Leak OBD 3000-0BDLL-58X46 T-Bar Square collar designed for 20”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.
