by 
The Curious Bag
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<h4 class="dechead">On One Hand: There Are Some Potential Risks
A vent free gas stove vents its exhaust directly into the structure in which it's installed. While gas stoves tend to burn very cleanly, one possible exhaust product is carbon monoxide (CO), a toxic gas that can cause confusion, nausea, and death. Another is water vapor, which may result in physical damage to the structure.
On the Other: The Risks Are Minor
All post-1980 vent free heating systems include an Oxygen Depletion Sensor (ODS) that turns off the flame if oxygen levels fall too low. Vent free gas stoves also have a catalytic filter that removes at least 99 percent of the CO and water vapor in the exhaust. Furthermore, vent free heating systems have an outstanding safety record, as the building industry is quick to point out.
Bottom Line
A vent free gas stove can be considered safe if it has an ODS, has been professionally installed, is kept in good repair, and is located in a room with good circulation.
Source:
Home Energy.org: Regulating Ventless Heaters
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