This Master Flow 4-inch adjustable elbowGo to product viewer dialog for this item. is constructed from heavy-duty 26-gauge galvanized steel for superior durability and corrosion resistance. Designed to create angular turns in round HVAC ductwork, it is fully adjustable up to 90 degrees to fit various venting configurations. The elbow features a crimped end for a secure, easy fit into pipes or fittings of the same diameter. It is ideal for venting heating units like boilers, furnaces, and hot water heaters where high-temperature airflow is required

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