4” Dia. Round to Rectangular Duct Transition Adapter, 3-1/4″ x 10″ Galvanize…

6″ Aluminum Rectangular To Round Duct Vent Range Hood Universal Microwave Vent

4” Dia. Round to Rectangular Duct Transition Adapter, 3 3.25″ x 10″ to 4″ Dia.