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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The Net Present Value (or NPV) is an investment term that represents the difference between the present (and/or discounted) value of cash flow in the future and the present value of the investment and any cash flow that may accumulate in the future.