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Today's Hours 8am - 11pm estThe premium interior piece for your two-part assembly! Designed to clamp a 1" duct board through a 3.5" hole, our product forms a tight and secure seal that ensures optimal performance and efficiency for your air duct system. Our inside take-off is also specially designed to guide air into the duct, maximizing airflow and minimizing energy waste. Invest in our interior piece today and enjoy a reliable and high-performing air duct system that exceeds your expectations!