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| Natural clay tile
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A ceramic mosaic tile or a paver tile made by either the dust-pressed or the plastic method from clays which produce a dense body and a distinctive slightly textured appearance. |
| Natural cooling
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Space cooling achieved by shading, natural (unassisted, as opposed to forced) ventilation, conduction control, radiation, and evaporation; also called passive cooling. |
| Natural draft
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Draft that is caused by temperature differences in the air. |
| Natural draft cooling tower
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A cooling tower using natural air circulation to cool water or another liquid. Used in power plants and chemical refineries. |
| Natural finish
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A finish applied to wood that provides protection without masking the natural grain and color. |
| Natural gas
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A naturally occurring gas used as a fuel in furnaces and power plants. Natural gas is commonly found in oil-producing areas. |
| Natural gas steam reforming production
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A two step process where in the first step natural gas is exposed to a high-temperature steam to produce hydrogen, carbon monoxide, and carbon dioxide. The second step is to convert the carbon monoxide with steam to produce additional hydrogen and carbon dioxide. |
| Natural resin
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Organic fluid used to make paint and varnish. |
| Natural vacancy rate
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The average vacancy rate for a rental property market that would result if supply and demand were in balance. This level to which vacancy rates adjust over the long term is a benchmark by which current vacancy rates in the market are considered high or low. |
| Natural ventilation
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Circulation of air without the assistance of a fan or other mechanical device. Naturalization Act of receiving the rights and privileges of a citizen including property rights. |
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