Livingston Fireplaces, Inc.
Log & Fireplace System Venting Options
Today's hearth products are vented in three ways:
natural draft (vented through the roof), direct vent, and vent-free. Below are
the options for gas hearth appliances.
Natural Draft (Class B) Venting
Natural draft hearth appliance take in combustion air
from the home and vent products of combustion outside the home.
Direct vent appliances draw combustion air from
the outdoors and exhaust its combustion products to the outdoors,
eliminating the need for a standard chimney system. A glass panel in direct
vent units is critical to keeping the combustion system sealed from the
home, maintaining high efficiency and indoor air quality. Direct vent piping
can go out the wall directly in back of the unit or go upward from the top
of the appliance then though the wall. Various models differ. Check with
Currently, the majority of gas fireplace sales are direct
Unvented or Vent-Free
vent-free refers to the kind of hearth appliance
that draws its combustion air from inside the home and is designed to burn
so efficiently that it eliminates the need for venting.
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Livingston Fireplaces, Inc. Copyrighted © 2007
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Hearth, Patio & Barbecue Association All rights reserved.