A window screen, insect screen or bug screen is a metal wire, fiberglass, or other synthetic fiber mesh, stretched in a frame of wood or metal, designed to cover the opening of an open window. Its primary purpose is to keep insects, leaves, debris, birds, and other animals from entering a building or a screened structure such as a porch, while permitting fresh air-flow.
Window screen materials include chemical fiber, low carbon steel wire, stainless steel wire, Al-Mg Alloy wire, galvanized wire, PVC wire, aluminum wire.
The specifications include 14X14mesh, 16X14mesh, 16X16mesh, 18X18mesh, 18X14mesh, and the wire diameter generally is BWG31 or BWG32