Abstract: A method for manufacturing a vented board includes the steps of providing a metal plate, forming a mesh area in the plate, and punching a recessed portion on the plate to make at least one part of the mesh area extend to form a side wall of the recessed portion with a thickness of the mesh area substantially remaining constant. The mesh area includes a number of hole units. Each hole unit defines a hole and includes a plurality of borders bounding the hole. Every two adjacent hole units share a corresponding one of the plurality of borders. Before punching the recessed portion, a center line of each border is a curve line.