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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Definition of net present value NPV. One way of calculating the potential return from an investment. This is basically the current value of the investment plus the present value of future cash flows, minus the initial cost of the investment plus the present value of any future costs. Present value is calculated by applying an appropriate discount rate to the expected future returns and costs.