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Learn About Stove Vent Classifications
Direct Vent
Direct vent appliances have a specially designed vent and air intake system which provides all combustion air for the appliance from the outside atmosphere and which discharges combustion by-products directly to the outside. The venting components are designed as a part of the appliance and require no further venting components for installation.
Type of Gas Venting
The listed gas vent is a factory-made and listed system designed, constructed, and installed exclusively for removing products of combustion, excess air, and dilution air resulting from burning fuel gas. Metal vents employ double-wall construction enclosing an insulating air space. This air space helps keep flue gases warm and reduces heat transferred to nearby combustibles.
Type B Vents
Type B vent is a double-wall metal (usually aluminum and galvanized steel) pipe tested and listed for use with listed gas appliances with draft hoods. Components from different manufacturers are not interchangeable.
Chimneys
It is important to distinguish between chimneys and vents. A chimney is a vertical passageway for conveying flue or vent gases to the outside atmosphere. A chimney may, depending on materials, construction, and listing, be suitable to handle the by-products of solid or gas combustion (class A), whereas a gas vent is appropriate only for fuel gas burning appliances (class B). Gas appliances must NEVER be connected to a chimney flue serving an appliance (fireplace, wood stove, or fireplace insert) designed to burn solid fuel. Not all chimneys are suitable for use with gas appliances, and not all gas appliances can be used with chimneys. There are two main types of chimneys:
Factory-Built Chimneys
Factory-built chimneys are listed manufactured venting systems. Their parts are designed to be used without alteration and only with components of the same make and model.
Masonry Chimneys
Masonry chimneys are field-constructed chimneys using brick, stone, cement block, or other masonry materials. These must be “built and installed in accordance with Standard for Chimneys, Fireplaces, Vents and Solid Fuel Burning Appliances, ANSI/NFPA 211, or other local building codes, and lined with approved clay tile flue lining, a listed chimney lining system, or other approved material that will resist corrosion, erosion, softening, or cracking from vent gases at temperatures up to 1800 degrees F.”
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