High Efficiency Gas Furnace Venting

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.

High efficiency gas furnace venting.

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. Traditional gas fired forced air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes or chimneys. When the vent is withdrawing air from the house it expels the gas outside through the vent. In a great majority of cases plastic piping is used to vent high efficiency equipment.

Two cases which can cause poor venting are the oversizing of the vent or reducing the. A high efficiency condensing furnace can achieve efficiency ratings of 90 or above. 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. Venting for high efficiency gas furnaces assembly here are some good venting practices.

It uses a venting system to extract that heat before venting. 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. What is vented is a residual corrosive condensate of water and carbon dioxide. This residual liquid is highly acidic.

High e furnaces have separate 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. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. This ensures the water heater can heat the vent pipe enough to get exhaust gasses to rise out of the house.

Example of high efficiency furnace venting on a roof 2. Like a conventional furnace it takes in cold air from the house and runs it through an air filter. On the other hand the higher the efficiency of a furnace the lower the flue gas temperature. Higher btuh furnaces produce higher flue gas temperatures.

Of the vent plus the furnace input and efficiency are factors affecting the temperature of the flue gases. Also known as the type b this vent is operating on the natural air convection. It moves the air with a circulating fan. And it has a gas burner with electronic ignition although condensing furnaces may have more electronic controls.

This type of pipe is called b vent. How a high efficiency condensing furnace differs.