Some buildings, as well as airplanes and other man-made environments (e.g., satellites and the Space Shuttle) use foam, folded paper, or fiberglass spun filter elements. Another method, air ionization, uses fibers or elements with static electricity charges, which attract dust particles. Air intakes from internal combustion engines and air compressors tend to use paper, foam, or cotton filters. Oil bath filters are not preferred apart from niche use. Gas turbine air intake filter technology has improved significantly in recent years, due to improved aerodynamics and fluid dynamics of gas turbine air compressor parts.