Ventless logs are not legal in California as well as some cities and municipalities.Ventless logs can cause eye irritation and coughing spells to those who are sensitive.So if you have a sensitive nose, you may not be able to handle the smell and will be greatly dissatisfied with ventless logs. Ventless logs produce an odor that many people equate to the smell of burning kerosene.This will introduce cold air into the room and offset some of the heating benefits that ventless logs claim to have. If you burn your ventless logs for more than an hour or so, you must crack open a window to allow air into your home to replace the oxygen burned by the ventless logs.You must be careful not to burn your ventless logs for extended periods of time with windows closed, otherwise they can potentially deplete the oxygen in your home.Because of this, ventless gas logs will introduce excess moisture into your home which can result in mold or mildew. The main byproducts of burning gas cleanly are Carbon Dioxide and Water Vapor.Much better heat output than vented gas logs.However, there are many negative features commonly associated with ventless logs that you must be aware of before you decide to purchase them: The beauty of this type of system is that 99.9% of the heat produced by the gas logs goes into the room, so they produce substantially more heat than their vented counter-parts. Since there is little or no exhaust, they can be burned with the damper closed. Ventless gas logs (often referred to as "Vent Free" gas logs) have specially designed burners that burn the gas cleanly and produce almost no exhaust.somewhat like the way a gas range in a kitchen works. Uses slightly more gas than ventless logs.Since the damper is open, most of the smell will go up the chimney.Flame dances and wraps around logs like real wood.Flame is much taller than ventless logs.Extremely realistic flame pattern that looks like a wood fire.If the flame is standing still or pushed out toward the room, then your fireplace is not drafting enough and you must open the damper more. If the flame from the lighter (candle) is being drawn in toward the fireplace, then you are OK. Hold a lighter or candle in front of the fireplace opening near the top. A good way to test this is to turn on your gas logs with the damper slightly closed. However, in most cases, you can offset this heat loss by slightly closing the damper.but you must be careful that the exhaust from your logs is not coming into the room because, just like burning real wood, it contains Carbon Monoxide. The downside is that most of the heat goes right up the chimney. The real beauty of vented gas logs is that they produce substantially more yellow flame than ventless logs which makes them look far more realistic. This exhaust needs to be able to go up the chimney. The reason for this is that they do not burn the gas cleanly and create exhaust that is very similar to burning a real wood fire. "Fully Vented" gas logs must be burned in a fireplace that is capable of burning real wood and must be burned with the damper open.
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