High Efficiency Furnace Exhaust Slope

Venting for high efficiency gas furnaces materials.

High efficiency furnace exhaust slope.

This allows any condensate in the vent to run back to the furnace so it can be collected and carried away. Look in your install manual most manufacturers will call for the furnace to be installed with a slight forward pitch to allow condensate to drain from the heat exchanger. Improper slope of pvc vent pipes high efficiency condensing furnaces require that pvc vent pipes be discharged to the outside of a home or business. Traditional gas fired forced air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes or chimneys.

The exhaust piping should be pitched at least 1 4 inch per foot to allow condensate to drain freely back into the furnace. How a high efficiency condensing furnace differs. This high efficiency venting system must be installed when you install the new furnace. Also known as the type b this vent is operating on the natural air convection.

In a great majority of cases plastic piping is used to vent high efficiency equipment. The vent should slope up away from the furnace at a quarter inch per foot. Due to the condensing nature of a high efficiency furnace its venting must be made of a material that is resistant to corrosion. There are several other important aspects of high efficiency furnace venting.

Incorrect slope of the exhaust pipe down toward the outdoors rather than back towards the furnace. That means slope the venting down towards the furnace typically a slope per foot of length minimum and also slope the furnace itself. It moves the air with a circulating fan. This is very important and something many do it yourselfers overlook.

Other aspects of high efficiency furnace venting. While the condensing furnace is different in its design and repair needs it does have some similarities to a conventional furnace like a conventional furnace it takes in cold air from the house and runs it through an air filter. The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process. The pvc pipes must be sloped at a minimum pitch of per foot back to the furnace.

Vents positioned too close to the ground where they can be blocked by snow drifts or critters. If the condensate drains outside it may freeze and block the vent with ice. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. When the vent is withdrawing air from the house it expels the gas outside through the vent.

The vent length can often be as much as 60 feet 90 degree elbows count for 10 feet.