Published at Saturday, September 15th, 2018 - 22:10:08 PM. Fireplace. By Fanny Ungar.
Ventless gas logs are designed to be used indoors and have several safety features that make them safe inside your home. Manufacturers of ventless gas logs have a limit to the amount of BTU’s burned which limits the size of most unvented gas log burners to 30". The size of a firebox that would comfortably hold a 30" gas burner is 42" to 48" which is still a large fireplace. A standing pilot assembly stays lit and heat is tracked with a thermocouple. If the flames go out for any reason, the thermocouple cools and gas stops at the valve. Oxygen depletion sensors are also attached to the gas valve to ensure the flames do not burn up so much oxygen in the house that unsafe conditions are created.
Outdoors a ventless gas log cannot deplete oxygen or fill your home with gas but a different set of issues ensues. Oxygen Sensors can get pollen and dust in them and wind can confuse the pilot assembly’s ability to provide continuous heat to the thermocouple. The design of the fireplace and the placement of the logs should be discussed with a professional to minimize these possibilities. These issues do not risk the safety of your family but if the thermocouple thinks the pilot is out because the wind is directing the flame in another direction, your gas log burner will turn itself off. An experienced installer will manipulate the mounting bracket to work around wind issues and position the Oxygen Depletion Sensors so they do not get clogged with pollen and dust.
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