Lambro 4" x 8' Laminated Transition Duct White Louvered Vent Kit

This 1379W 4" x 8' Laminated Transition Duct White Louvered Vent Kit.The minimum size duct allowed on most range hoods is 3-1/4″ by 10″ which is equivalent to a 6″ round. For use with rigid ductwork.