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The fineness of a screen mesh is measured in wires per inch on the warp (length) and the weft or filler (width). An 18×14 mesh has become standard; 16×16 was formerly common and other common sizes are 18×18 and 20×20. For comparison, a typical screen in a clothes dryer has a nylon 23x23 mesh screen.
These terms have caused confusion as to what a rain screen is but all reflect the rainscreen principle of a primary and secondary line of defense. One technical difference is between a plane (a gap of 3 ⁄ 8 inch (9.5 mm) or less) and a channel (a gap of more than 3 ⁄ 8 inch (9.5 mm)). [citation needed]
Screens date back to China during the Eastern Zhou period (771–256 BCE). [1] [2] These were initially one-panel screens in contrast to folding screens. [3] Folding screens were invented during the Han dynasty (206 BCE – 220 CE). [4] Depictions of those folding screens have been found in Han-era tombs, such as one in Zhucheng, Shandong ...
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