High Efficiency Gas Furnace Venting

When a standard efficiency furnace is replaced with a high efficiency the existing vent pipe must be replaced with the vent size the water heater requires.

High efficiency gas furnace venting.

This ensures the water heater can heat the vent pipe enough to get exhaust gasses to rise out of the house. A high efficiency condensing furnace can achieve efficiency ratings of 90 or above. A high efficiency furnace uses a different type of venting system because it extracts the heat that remains in those combustion gases before venting the resultant mixture of water and carbon dioxide. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner.

The two systems use different venting systems. Venting for high efficiency gas furnaces materials due to the condensing nature of a high efficiency furnace its venting must be made of a material that is resistant to corrosion. 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. High e furnaces have separate venting.

How a high efficiency condensing furnace differs. 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. On the other hand the higher the efficiency of a furnace the lower the flue gas temperature.

This is mostly stuff i learned during a training session from ipex one of the major manufacturers of plastic piping with a little of my personal experience and tips first of all venting must be planned in order to be sized properly. It is classified as type bh venting. Also known as the type b this vent is operating on the natural air convection. This type of pipe is called b vent.

Venting for high efficiency gas furnaces assembly here are some good venting practices. It uses a venting system to extract that heat before venting. This residual liquid is highly acidic. And it has a gas burner with electronic ignition although condensing furnaces may have more electronic controls.

Higher btuh furnaces produce higher flue gas temperatures. What is vented is a residual corrosive condensate of water and carbon dioxide. Two cases which can cause poor venting are the oversizing of the vent or reducing the. Example of high efficiency furnace venting on a roof 2.

It moves the air with a circulating fan. In a great majority of cases plastic piping is used to vent high efficiency equipment.