High Efficiency Furnace Exhaust Slope

There are several other important aspects of high efficiency furnace venting.

High efficiency furnace exhaust slope.

The exhaust piping should be pitched at least 1 4 inch per foot to allow condensate to drain freely back into the furnace. In a great majority of cases plastic piping is used to vent high efficiency equipment. 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. Vents positioned too close to the ground where they can be blocked by snow drifts or critters.

The vent should slope up away from the furnace at a quarter inch per foot. The vent length can often be as much as 60 feet 90 degree elbows count for 10 feet. Also known as the type b this vent is operating on the natural air convection. The pvc pipes must be sloped at a minimum pitch of per foot back to the furnace.

It is classified as type bh venting. How a high efficiency condensing furnace differs. 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. This allows any condensate in the vent to run back to the furnace so it can be collected and carried away.

If the condensate drains outside it may freeze and block the vent with ice. It moves the air with a circulating fan. This is very important and something many do it yourselfers overlook. 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. Venting for high efficiency gas furnaces materials. In contrast modern high efficiency condensing furnaces exhaust much cooler gasses and need only plastic pipe materials such as pvc cpvc or abs for their exhaust vents some high efficiency furnaces also include a plastic pipe for intake area and all types. The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process.

And it has a gas burner with electronic ignition although condensing. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. 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. When the vent is withdrawing air from the house it expels the gas outside through the vent.

Due to the condensing nature of a high efficiency furnace its venting must be made of a material that is resistant to corrosion.