This Master Flow ceiling register box is designed to create a seamless transition from a 6-inch round pipe or insulated flexible duct to a 6-inch by 6-inch square air register or grille. Constructed from durable 30-gauge galvanized steel, it provides exceptional strength and corrosion resistance for long-term HVAC performance. It is ideal for residential or light commercial ceiling applications and can be easily installed using sheet-metal screws. Note that snap-on rails and installation screws are sold separately

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