This Master Flow 12-inch ductboard starting collar is a high-quality HVAC component made from durable 30-gauge galvanized steel. Designed for transitioning from flat surfaces like a plenum to 12-inch round pipe or insulated flexible duct, it features extra-long tabs to accommodate various duct board thicknesses up to 1-1/2 inches (R6 value). Its robust construction ensures long-lasting performance and secure airflow connections in residential or commercial heating and cooling systems

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