This Master Flow 90-degree stack boot is a critical HVAC fitting designed for in-wall duct transitions. Constructed from durable 30-gauge galvanized steel for corrosion resistance, it provides a right-angle transition from a 6-inch round pipe or flexible duct to a 10-inch by 3-1/4-inch rectangular stack duct. Ideal for plumbing and air distribution systems, this universal boot can be secured with sheet metal screws and sealed with approved mastic or duct tape to ensure efficient airflow

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