View 1 of 3-1/4" x 10" to 4" Rectangular to Round Duct Transition, Microwave Vent Kit

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View 1 of 3-1/4" x 10" to 4" Rectangular to Round Duct Transition, Microwave Vent KitView 2 of 3-1/4" x 10" to 4" Rectangular to Round Duct Transition, Microwave Vent Kit