For these reasons, exhaust from a condensing furnace should never be vented through a standard chimney. These PVC pipes are connected to the furnace and expelled outside. 99. Replace the return air filters. Any resulting gas byproducts are cool enough to vent them outside through a PVC pipe. A high efficiency condensing furnace, on the other hand, makes further use out of those gases before they leave your home. This practice is common with standard efficiency (80%) furnaces. $6.99 $ 6. The Spruce uses cookies to provide you with a great user experience. Exhaust sloped toward furnace HORIZONTAL – STANDARD (RXGY-D02, -D03) Correct relationship – exhaust to intake 12" min. The H2O in the exhaust mixes with CO2 in the exhaust and creates Carbonic Acid, H2CO3. The vent should slope up away from the furnace at a quarter-inch per foot. As the exhaust product cools, it produces condensation. This field is for validation purposes and should be left unchanged. Selkirk Metalbestos Selkirk 104800 Gas Vent, 4" Cap Bird Proof Type B Top Round, galvanized. Traditional gas-fired, forced-air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes, or chimneys. These different plastics have different maximum heat service temperatures: PVC has the lowest rating at 140 degrees Fahrenheit, CPVC has the highest at 194 degrees, and ABS falls in between, at a maximum service temperature of 160 degrees. $11.98 $ 11. You can capture that heat with a high efficiency condensing furnace. For health and safety reasons, these combustion gases must be expelled through the furnace ventilation system out of your home. 5 Common Problems With High-Efficiency Furnaces Venting in High-Efficiency Furnaces. 99. Check them regularly and remove any obstructions. The condensed water is run to a floor drain. Rats and mice can enter your home through any number of openings that you might take for granted. That depends on whether you have a standard efficiency or a high efficiency furnace. Something you may have noticed is snow and ice building up around the vents of your high-efficiency furnace. If the condensate from a high efficiency furnace leaks out of the PVC pipes, or if the pipes are not draining the condensate correctly, you could experience damage to your home and you may not be aware of it until the damage becomes significant. Get it as soon as Thu, Feb 18. A high efficiency condensing furnace can achieve efficiency ratings of 90 or above. High-efficiency condensing furnaces have two-stage combustion to extract as much heat energy as possible from burning gas. When installed correctly, this venting arrangement works with an 80% gas furnace (or … 4.3 out of 5 stars 181. schedule 40 pvc pipe) are within the safe working range of the equipment. 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. Since the exhaust pipe is running on a sidewall, the fan works together with the furnace. It also has special heat exchanger technology that is able to extract heat from the fuel combustion process for a longer period of time. How to Keep Rodents From Entering a High Efficiency Furnace Pipe. Proper sidewall venting requires installing separate vent pipes horizontally so that they vent to the outdoors through a wall of your home. $15.87 $ 15. Neither of these substances pose any serious threat to human health. With a conventional furnace (under 90% efficiency), combustion gases are exhausted through a vertical vent that's attached to your system. The International Fuel Gas Code states in section 503.4.1.1 (IFGS): “Plastic pipe and fittings used to vent appliances shall be installed in accordance with the appliance manufacturer's installation instructions.” But this lack of specifications can lead to confusion. Nowadays, you can also get a high efficiency furnace. Suitable materials for the vent and condensate pipes include PVC (polyvinyl chloride), CPVC (chlorinated polyvinyl chloride), and ABS (acrylonitrile-butadiene-styrene) plastic pipe, depending on the furnace’s specified exhaust gas temperature. … Introducing "One Thing": A New Video Series. You have won a free Read Article, 8000 Cessna Ave, Gaithersburg, MD 20879Call Us: (301) 900-5559Text Us: (240) 224-0905. High-efficiency (or “condensing”) furnaces exhaust the combustion gases and bring in fresh air through PVC pipes to the outside, usually routed through the sidewall of the house. Also, the acidic elements in the exhaust can damage unprotected chimney bricks and mortar.