Fireplaces: Bring on the Heat
Direct-vent and Vent-free
Direct-vent and vent-free gas-fueled fireplaces have much greater efficiency than a vented gas fireplace.
Direct vent appliances exhaust connect to the outdoors with a short pipe, and use a single vent to exhaust combustion gases; often, the same vent contains an inner sleeve that draws in fresh air for combustion.
Vent-free appliances are designed to produce such a low amount of carbon monoxide that they can be used safely without a vent to the outside. Some states restrict the installation of vent-less fireplaces, so check with your local building department to find out where you can use this kind of fireplace.
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