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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GSV stands for. 1  11. similar. GSV. 2  4. GSV. Greater Saphenous Vein. 3  4. GSV. Greater Saphenous Veins. 4  4. GSV. great saphenous veins. 5  5. GSV. Golden Shiner Virus. 6  4. GSV. Gestational Sac Volume.