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1550 Series Engineering/Performance Data
Ceiling opening must be 4” larger in length and width than the nominal duct size
Options * 2800 Series - Dynamic Fire Damper * Sleeve variations * 304 stainless steel construction * Fractional and odd sizes available h3
Zinc plated steel closure spring
950 Series Engineering/Performance Data
Volume Damper Low-Leak OBD 3000-0BDLL-50X50 Step Down Ceiling Diffuser 1550 Series Engineering/Performance Datah3. 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.
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