VENTING

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A pellet vent is a metal pipe that exhausts appliances that burn wood pellets, oil, or other pelletized biofuels. It's also known as a "PL vent" or "P vent". One end of the pipe attaches to the stove, usually with a chimney adapter, and the other end extends through the chimney and above the roof.

Black stove pipes are pipes that connect a wood or coal stove to a chimney or flue to vent smoke and gases safely and efficiently. They are typically made of black-painted steel and installed inside the home, passing through walls or ceilings. Black stove pipes come in different types, including single-wall and double-wall.

A Class A chimney is a factory-built chimney system that's assembled on-site by professionals. It's also known as a prefabricated or factory-built chimney. Class A chimneys are designed for residential use and can be installed on the interior or exterior of a home. They're often used for wood-burning fireplaces and stoves, and can also be used to transition stove pipe through walls or ceilings.

Double wall stove pipe is a pipe with two layers that connects a wood stove to a chimney. The inner layer is usually made of stainless steel to resist corrosion and retain heat, while the outer layer is often made of galvanized or aluminized steel. The two layers are insulated and have holes to allow air to flow between them, which helps keep the chimney warmer.

A gas vent is a passage or pipe that allows gas to escape from a gas-fired appliance or underground system.

Gas fireplaces can be vented one of three—technically two—ways:

Direct vent technology: A sealed combustion system protects indoor air quality by drawing outside air for the fire and expelling 100 percent of combustion exhaust and byproducts outside the home.

B-vent or “natural” venting technology: This system is not sealed; it draws air from a room into the combustion chamber and exhaust must be routed through the roof via a pipe.

Vent-free or ventless technology: This method actually relies on a higher burn temperature—rather than physical venting like in the cases of direct vent or B-vent—to rid the air of combustion byproducts.