![]() There are also air quality control issues due to the amount of moisture they release into the room air, and an oxygen sensor and a carbon monoxide detector are safety essentials.ĭirect vent fireplaces are fueled by either liquid propane or natural gas. They must be properly sized to the area to be heated. In the United States, some states and local counties have laws restricting these types of fireplaces. Ventless fireplaces (duct free/room-venting fireplaces) are fueled by either gel, liquid propane, bottled gas or natural gas.
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