In most cases, solid fuel hearth appliances are vented by natural
draft. 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 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.
Unvented or Vent-Free Unvented
and 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