Without proper ventilation and safety systems in place there can be serious health risks associated with burning gas in a ventless fireplace.
Are ventless electric fireplaces safe.
Even though heavily regulated for safety several states including california and massachusetts have banned ventless systems so have canada and several other countries.
Ventless fireplaces do not produce soot and ash as wood burning fireplaces do.
Ventless fireplace health risks while no deaths from vent free fireplace incidents have been reported nachi says some municipalities have restricted or outlawed vent free fireplaces.
According to the vgpa ventless fireplaces can be safely operated in tight homes because an unvented gas heating appliance would be operating less during the usage period this means that the amount of nitrogen dioxide in the room would be lower.
The fact of the matter is that vent free gas burning fireplaces and other other appliances definitely do emit elemental gasses into the home including carbon dioxide not a huge deal.
Another safety device is the thermo coupler for the pilot line.
Ventless fireplaces are heavily regulated by federal agencies for safe operation in your home but the debate still rages on are they really safe.
Ventless fireplaces produce small amounts of nitrous dioxide and carbon monoxide which can be deadly in large doses.