Furnace Direct Vent Through Roof

If your furnace has an afue rating below 90 percent it will most likely have a flue pipe that goes up through your roof.

Furnace direct vent through roof.

The furnace uses an exhaust vent motor that pushes the exhaust gas through the vent pipe creating a positive static pressure in the vent. That depends on whether you have a standard efficiency or a high efficiency furnace. What to know before you install b vent furnace pipe. Type b vents are a standard design that most modern gas furnaces use.

This system creates an air tight combustion chamber which improves efficiency because it eliminates back drafting. The condensing furnace produces condensed exhaust gases that contain water and carbon dioxide which together form carbonic acid that results in a corrosive condensate. 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.

Gases produced during combustion are very hot and as such easily rise through the flue. The vent outlet must be installed a minimum of 12 in. Not all fireplaces require venting and some don t require direct vent pipe but the best fireplaces do. Most furnaces are vented directly through roofs with either a single pipe or a two pipe system.

The furnace may be vented vertically through the roof. A direct vent gas furnace has an air intake and exhaust system that is enclosed in a sealed pipe system. It draws air from within the house for combustion. What to know before you install b vent furnace pipe.

Also known as the type b this vent is operating on the natural air convection. 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. Ok you need an exhaust system for your new direct vent gas fireplace. The air rises enough to get expelled through your roof.

When the vent is withdrawing air from the house it expels the gas outside through the vent. The pressure differential creates a natural way for the gases to exit the flue. Above the air intake inlet. 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.