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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]
The two layers in high-quality construction will both be thick 3 ⁄ 4 inch (19.1 mm) sheets (as will the third when present), but they may have a combined thickness of only half that in cheaper construction – 1 ⁄ 2 in (12.7 mm) panel overlaid by 1 ⁄ 4 in (6.4 mm) plywood subflooring. At the highest end, or in select rooms of the building ...
It has been estimated that poor road surfaces cost the average US driver $324 per year in vehicle repairs, or a total of $67 billion. Also, it has been estimated that small improvements in road surface conditions can decrease fuel consumption between 1.8 and 4.7%. [64]
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Although such information contains long lists of sieve sizes, in practice sieves are normally used in series in which each member sieve is selected to pass particles approximately 1/ √ 2 smaller in diameter or 1/2 smaller in cross-sectional area than the previous sieve. For example the series 80mm, 63, 40, 31.5, 20, 16, 14, 10, 8, 6.3, 4, 2.8 ...
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