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    How to sterilise soil in an oven or microwave

Fly screens

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.