Ventless fireplaces fueled by gas or propane rely on indoor air for combustion, and they exhaust a low level of their combustion gases into the room in which theyâre located. A chimney or flue isnât necessary. The risk to your health is a long-standing and ongoing debate.
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Net present value (NPV) is a popular measure of profitability used in corporate budgeting to assess a given project's potential return on investment (ROI). Because of the time value of the dollar, NPV takes into account the compounding of the discount rate over the duration of the project.