This Master Flow Universal Register BoxGo to product viewer dialog for this item. is a high-quality HVAC transition component designed to connect 6-inch round pipe or insulated flexible ductwork to an 8-inch by 8-inch air register or grille. Constructed from durable 30-gauge galvanized steel, it features a built-in flange for secure and easy installation between joists. The straight in-line design ensures efficient airflow and long-lasting performance in both residential and commercial heating and cooling systems

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