With the Sealed Wood Burning Fireplace, all the air employed is brought in from the outdoors, altogether independent of the home air, afterward the by products of the burning are transferred to the outside of the house. The gas fire place direct vent does not have to utilize the chimney but it makes usage of a venting system to bring in clean air for the burning.
This is made attainable by the gas fireplace vent. This is actually two vents in one. Think of it as a small-scale piping within a big piping of a double walled piping. The inside pipe will take the by products out-of-doors while the outer piping will bring in clean air indoors. The air getting inside will be warmed on the way in by the hot center vent tube. That also improves the efficiency of the direct venting.
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