Furnace Direct Vent Through Roof

Most furnaces are vented directly through roofs with either a single pipe or a two pipe system.

Furnace direct vent through roof.

It draws air from within the house for combustion. What to know before you install b vent furnace pipe. You can find some of these fireplaces here if you re looking for a vent free option you can find some great options here yes the best fireplaces on the market generally use a direct vent venting. The air is then vented outside through a b vent pipe which is set vertically to expel combustion air through the roof.

That depends on whether you have a standard efficiency or a high efficiency furnace. Gases produced during combustion are very hot and as such easily rise through the flue. Not all fireplaces require venting and some don t require direct vent pipe but the best fireplaces do. Even furnaces vented through walls are routed through vertical pipes that extend above the roof.

The hot combustion gases expand and get lighter as the cold air entering the furnace enters at a higher pressure. What to know before you install b vent furnace pipe. When the vent is withdrawing air from the house it expels the gas outside through the vent. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner.

A direct vent gas furnace has an air intake and exhaust system that is enclosed in a sealed pipe system. If your furnace has an afue rating below 90 percent it will most likely have a flue pipe that goes up through your roof. This system creates an air tight combustion chamber which improves efficiency because it eliminates back drafting. The furnace uses an exhaust vent motor that pushes the exhaust gas through the vent pipe creating a positive static pressure in the vent.

The vent outlet must be installed a minimum of 12 in. The pressure differential creates a natural way for the gases to exit the flue. The outlet inlet of the vent and air intake terminations shall be a minimum of 12 inches above highest anticipated snow level. The condensing furnace produces condensed exhaust gases that contain water and carbon dioxide which together form carbonic acid that results in a corrosive condensate.

The furnace may be vented vertically through the roof. Type b vents are a standard design that most modern gas furnaces use. Above the air intake inlet. Also known as the type b this vent is operating on the natural air convection.