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| Neoprene
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Oil-resistant synthetic rubber product that is used to make coverings where resistance to petroleum products is needed. |
| Nesting
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A method of reroofing with new asphalt shingles over old shingles in which the top edge of the new shingles is butted against the bottom edge of the existing shingle tab. |
| Net
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(1) An amount that remains after a calculation where deductions are taken. (2) Commonly used to refer to profit from a venture after all expenses are deducted. |
| Net (lower) heating value (nhv)
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The potential energy available in a fuel as received, taking into account the energy loss in evaporating and superheating the water in the fuel. Equal to the higher heating value minus 1050W where W is the weight of the water formed from the hydrogen in the fuel, and 1050 is the latent heat of vaporization of water, in BTU, at 77 degrees Fahrenheit. |
| Net cash flow
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Income from investment property after expenses (principal, interest, taxes and insurance) are deducted. |
| Net energy efficiency production (or balance)
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The amount of useful energy produced by a system less the amount of energy required to produce the fuel. |
| Net floor area
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Usable floor area after deducting stairs, walls, and similar features. |
| Net free vent area
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The area permitting unrestricted air flow. |
| Net generation
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Equal to gross generation less electricity consumption of a power plant. |
| Net income
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The amount remaining when expenses are deducted from gross income. |
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