This Master Flow 8 inch by 4 inch to 6 inch Universal Register Box is constructed from durable 30-gauge galvanized steel to ensure long-lasting performance in HVAC systems. Designed to create a straight in-line transition from a 6 inch round pipe or flexible duct to an 8x4 air register or grille, it features a built-in flange. This flange provides a convenient area for register screws and serves as a nailing area for joists or a sheetrock frame, allowing for easy installation before drywall is applied. Ideal for both residential and commercial venting applications, this box helps maintain efficient airflow while providing a secure mounting surface

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