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B-Vent (sometimes referred to as Natural Vent) - B-Vent gas fireplaces
use pipe (b-vent) that must be installed through the home and terminate above the
roof. They also use room air for combustion, but the amount of air they use
is minimal. B-Vent piping for gas fireplaces is relatively inexpensive, easy to
install, and must terminate above the roof line.
Direct Vent - In direct-vent gas fireplaces, you use special direct-vent
pipe recommended by the supplier. The direct-vent system involves two parts, one
part for the exhaust and one for combustion air intake. The gas fireplace itself
is a completely sealed combustion chamber and no air from the house is used for
combustion. The exhaust vents can go either out through a sidewall or through the
roof. Direct-vent piping is relatively inexpensive, easy to install, and in most
cases terminates on an outside wall making the installation of this type of gas
fireplace very versatile.
Vent-Free - A vent-free gas fireplace uses no venting pipe at all which allows
placement of the fireplace in many places otherwise unavailable to a vented fireplace.
The burner of the gas fireplace or gas log set is designed to be 99%+ efficient, therefore
there is no need to vent the appliance.
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