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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Posted by admin | Feb 5, 2017 | Auto maintenance | 0 |. The PCV valve is a control device which sends partially burned gases that come from the engineâs crankcase to the combustion chamber. Its name, PCV means Positive Crankcase Ventilation and is one of the oldest and most used emission control devices.