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3 1/4-Inch x 10-Inch to 4-Inch Diameter Galvanized Rectangular to Round Duct Transition Microwave Vent Kit Round Transition Vent Adapter for Connecting HVAC Range Hood Ducting Fittings
3 1/4-Inch x 10-Inch to 4-Inch Diameter Galvanized Rectangular to Round Duct Transition Microwave Vent Kit Round Transition Vent Adapter for Connecting HVAC Range Hood Ducting Fittings

4inch