Furnace Direct Vent Through Roof

What to know before you install b vent furnace pipe.

Furnace direct vent through roof. Not all fireplaces require venting and some don t require direct vent pipe but the best fireplaces do. The furnace may be vented vertically through the roof. Gases produced during combustion are very hot and as such easily rise through the flue. Above the air intake inlet.

Even furnaces vented through walls are routed through vertical pipes that extend above the roof. The pressure differential creates a natural way for the gases to exit the flue. If your furnace has an afue rating below 90 percent it will most likely have a flue pipe that goes up through your roof. The outlet inlet of the vent and air intake terminations shall be a minimum of 12 inches above highest anticipated snow level.

It draws air from within the house for combustion. Most furnaces are vented directly through roofs with either a single pipe or a two pipe system. The condensing furnace produces condensed exhaust gases that contain water and carbon dioxide which together form carbonic acid that results in a corrosive condensate. When the vent is withdrawing air from the house it expels the gas outside through the vent.

A direct vent gas furnace has an air intake and exhaust system that is enclosed in a sealed pipe system. The air is then vented outside through a b vent pipe which is set vertically to expel combustion air through the roof. What to know before you install b vent furnace pipe. The furnace uses an exhaust vent motor that pushes the exhaust gas through the vent pipe creating a positive static pressure in the vent.

Also known as the type b this vent is operating on the natural air convection. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. The vent outlet must be installed a minimum of 12 in. This system creates an air tight combustion chamber which improves efficiency because it eliminates back drafting.

That s because the combustion byproducts are in a gaseous form so the gases can float up through the flue pipe and out of your roof. Type b vents are a standard design that most modern gas furnaces use. The air rises enough to get expelled through your roof. Ok you need an exhaust system for your new direct vent gas fireplace.