This temperature is an indication that your furnace is not running at maximum efficiency and you are losing heat up the chimney. joel_14 Member Posts: 116. Rain water that runs down a plumbing vent pipe at the roof goes into the house drain system at a point past the traps at the plumbing fixtures that keep sewer gas out of the home, and heads harmlessly out to the sewer or septic tank. I have a Heil gas hot air furnace, about 5 years old. Single-walled vents are prone to getting very hot and are therefore advised to be at least 6 inches away from the wall's surface. Depending on how well insulated your house is, Ruppa says a 40,000 BTU fireplace would be more than enough to heat a large living or family room. It is the most common vent pipe. $318.41. By the time a new liner system, complete installation and the unit itself is bundled together, the cost could exceed $5,000. Benefits. Double wall chimney pipes are designed to protect buildings from high temperatures generated by some heating appliances. A. O. Smith power vent gas water heaters are equipped with an electric blower fan that is installed on top of the water heater, which requires an electrical outlet to be close to the water heater. How Hot Does A Water Heater Vent Pipe Get? Pipe or fittings may distort due to excessive heat buildup. When the water tank heater is unable to vent, it shuts off, depriving us of hot water. I was also told the flexible plastic pipe was inferior. December 2002. If any thermocouple rises more than 90F above the ambient room temp., the test fails and they have to relocate the plywood farther away at that point. A basic hood vent rests 24 to 30 in (61 to 76 cm) above a stovetop. UL also specifies that chimneys must withstand flue gas temps as high as 2000 for ten minutes. . How Do Fires Get Started? The natural flow of heat creates a convention loop; as hot air exits the pipe, cooler, denser air is siphoned in to fill the void. "Direct vent" refers to a sealed-combustion system in which air for combustion is drawn from the outdoors, and waste combustion gasses are exhausted to the outdoors. It is carefully engineered to barely interfere with the glass's . Isolate the water heater by closing doors and windows, shutting off the furnace, and letting the water heater run solo. We have a high-efficiency gas-fired hot water heater (in our a basement) that is vented to the outside of our house. You can direct vent with oil on some boilers approved for it. Thus, the water heater vent is now an orphan in the chimney. With an exhaust stack temp. Model: 4DT-CCKB. This can result in substantial savings, $500-$1500, depending on size and cost in new home construction. UL standard 103 requires pipe capable of safety operating with an internal temperature of 1,000 degrees Fahrenheit and withstanding a maximum temperature of 1,700 degrees Fahrenheit. Noritz 4" PVC to 4" Single-Wall Stainless Steel . For example, a 30' straight run is about equivalent to a 20' run with two elbows. . Power Vent Water Heater. The temps range depending on the size and type of furnace. The only time that rain causes problems at a roof vent is when the flashing, called a . Harman P-61A VC "1977" Vigilant (gone but not forgotten) Woodstock Wannabe grnsl2 Not open for further replies. 3' (91cm) above if within 10' (3m) horizontally. DuraVent 4" Inner Diamter DirectVent Pro Direct Vent Pipe - Galvanized Round Horizontal Termination Cap Square Base (Aluminum) Model: 46DVA-HRCS. However, every fireplace has an almost-invisible safety screen that prevents your hand from actually touching the glass. If you do have to deal with blockages, be sure you use a UL 103HT double wall chimney pipe. The inside wall of these double- or triple-wall pipes is stainless steel for this purpose. Ensure you use the right gaskets or duct sealant as directed by the manufacturer's installation instructions. This is a simple system that works well when the exhaust gases can be vented vertically. Back-drafting is usually the result of an inadequate vent design. So when it frosts over we have to go outside and clean off the vent. Direct vent fireplaces, on the other hand, use natural gas or propane as their fuel, and the exhaust fumes are significantly less hot. tankless water heaters draw in outside air. I wouldn't worry much about not having a square foot of insulation here and there. 5,490 satisfied customers. The Rheem Professional Classic Plus Power Direct Vent Water Heater may be just what your home needs. The inner pipe provides venting to the outside, while the outer pipe carries outside air into the fireplace. The temperature in the flue pipe of your furnace can run as high as 400 degrees Celsius, which is about 750 degrees Fahrenheit. T. Extend the exhaust pipe up towards the roof to reduce the noise. But this cost is worth it to ensure the installed fireplace insert is safe and functional. I have a Heil gas hot air furnace, about 5 years old. Avoid using longer than recommended vents and an oversized vent pipe. As such, the direct vent gas pipe that is used on these units has an aluminum inner wall. . Assemble the vent pipe to the heater vent collar. 2 This rising air needs to find a way out of the heater. In this regard, it's not necessary to install a roof vent cap to prevent rain from getting in the vent pipe. The glass on the front of a direct - vent fireplace does get very hot, in order that it can radiate a LOT of heat into your room. It pulls in air from the outdoors through the outer chamber of a double vent pipe; the inner chamber of this pipe exhausts fumes. 72" (1.8m) 36" (90cm) 5b. These pipes only need a 2-inch clearance to combustibles because they remain cool on the outside, while their internal design allows them to withstand temperatures as high as 1,700 or 2,100 degrees Fahrenheit for a limited time. Direct-vent units pull in air from outside the home or building and have two vents, one for intake and one for exhaust . B-vent, also known as natural vent, fireplaces incorporate a standard vertical vent pipe. A direct vent fireplace uses outdoor air instead of indoor air for combustion. Venting for high-efficiency gas furnaces - Materials. Cons: Direct fireplaces have a sealed glass front and typically a smaller flame than a b-vent fireplace or a vent-free fireplace. To do this: Cut enough aluminum flashing from the roll to wrap around the vent pipe, with an extra 6 inches to spare. In a direct-vent setup where the tankless utilizes two pipes, . In direct vent fireplaces, a pair of rigid flues that nestle inside one another is installed in sections ranging from 4" to 48" in length, with 90- and 45- angled elbows that allow for flexibility with placement. 50 Gallon Capacity. 3. While many stove pipe and direct vent pipe systems use 90-degree and 45-degree elbows, Class A chimney pipe systems do not allow for more than a 30-degree elbow. The furnace. The area surrounding the fireplace can get hot as well when a fire is burningin some cases, it can get as hot as 190 . A direct vent system typically results in lower water heating costs, because the exhaust gases are vented vertically, with no extra power required as is the case with the power vent water heater. Cut 1-inch deep slots a few inches apart along the top side. Model: 46DVA-CS. $174.95. Metalbest 6" Inner Diameter - Chimney Direct Vent Pipe - Double Wall - Direct Vent Conversion Kit. It's only about 6 yrs old, so I hate to replace it, but . On the other hand, a double-walled vent has an extra layer around its conducting layer. For each elbow in your duct, reduce the total length of your duct run by 5'. As the outside air is sucked into the venting system, it's heated by the hot central venting pipe, improving efficiency. In a great majority of cases, plastic piping is used to vent high-efficiency equipment. Indoor Ovens: It's advisable to use a UL103HT double wall chimney pipe with a direct vent approved. 6" Anchor plate for double wall chimney for Garzoni-350 oven. 48" 8. The blower pushes the exhaust and excess heat through the exhaust venting. Upvote. Traditional gas-fired, forced-air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes, or chimneys.In contrast, modern high-efficiency condensing furnaces exhaust much cooler gasses and need only plastic pipe materialssuch as SS, PVC, CPVC, or ABSfor their exhaust vents.Some high-efficiency furnaces also include a plastic pipe for the intake area, and all . First, with only one pipe, installers only need to make one penetration in the wall or ceiling. Natural convection allows hot fireplace combustion gases to rise through the pipe and exhaust to the . A power vent water heater uses a blower or fan to exhaust gases by pushing them through vent pipes that are horizontal. Vents terminating at the roof should have a rain cap or other type (90+45 bends). The easy answer is oxygen is a key element in combustion, therefore, your furnace needs air. A DIY wood-burning insert may be found for under $2,000. Keep a dirty pipe and get those temps much above 1000 inside and you may very quickly get to test that pipe at 2000. If your device is set to deposit water at 140 degrees Fahrenheit to reduce legionella bacteria production, the flue gas temperature will be approximately 160 degrees Fahrenheit when the unit is new. Second, unlike exhaust vent pipes which are hot to the touch and thus require clearance to avoid contact with the wall, concentric vents are cool to the touch because they keep the warm exhaust air on the inside. Hot exhaust from the water heater naturally rises up through the vent and into the air outdoors, creating a draw that promotes this upward airflow. A direct vent fireplace is a prefabricated metal fireplace that employs a direct-vent combustion system. The difference is that a power vent water heater pulls in combustion air from the space around the appliance, then uses a fan to propel the exhaust through the vent. Read customer questions about Direct Vent Pipe - answered by our fireplace specialists. Hence the protective screen that is placed in front of the glass. Thursday, August 9th 2012. Condensation. Most roof vent pipes are a part of a plumbing system and are connected to water systems that are wet all the time. Yes. Available in 1 Finish. A new high-efficiency furnace may now vent through a plastic pipe that exits a sidewall of the home, not the chimney. Now, you must form an insulation dam to prevent insulation from contacting the flue pipe. "A direct vent appliance draws its combustion air from outside and the vent exhausts the combustion fumes to the outside as wellit does that all through the direct vent pipe." Direct vent gas fireplaces and inserts produce highly efficient heat in a broad range of sizes and can be installed almost anywhere in the home. A 4" inner flue is surrounded by an outer flue that is either 6 5/8" or 8" in diameter. Create a sound barrier. Double- and triple-wall insulated pipe is listed as Class A vent pipe and must meet either UL standard 103 or 103HT. Model: 4DT-CCKA. Do not store pipe or fittings near equipment that generates heat. Get a FREE Design & Quote From Our Chimney Specialists! Make sure there is at least 24 of straight duct between each elbow. Due to the condensing nature of a high-efficiency furnace, its venting must be made of a material that is resistant to corrosion. As hot air exhausts through the central pipe, it heats the cold outdoor air coming in through the outer pipe, so the combustion air is already warm when . and hot air rises, that was easy to do. . 'Direct Vent' describes a sealed combustion system in which in- 8" Double wall chimney for Verona-420 and Verona-560 ovens. 36" above forced-air intakes The exhaust vent terminal shall be located at least 3-feet above any forced air inlet located within 10-feet. The furnace would start and light the burners, then after about 30 seconds the burner would read more. Furnace exhaust is hotter than the surrounding air. The pipes can be set in two ways: horizontally through the sidewall or vertically through the roof. Measure the space between the stove and the exterior wall. The Stardance Direct Vent/Natural Vent Room Heater must be isolated from the gas supply piping system by closing its indi-vidual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig. A recent blower door test/audit has alerted me to the fact that my natural draft hot water heater can backdraft in worse case scenarios (range hood/clothes dryer/bath fan on). . Extend the exhaust pipe towards the ground to muffle the sound. A typical 80% forced air furnace can produce flue gasses upwards of 250. "Direct vent" does not simply mean that all gasses from combustion are . Natural gas or propane hot water heaters are generally less expensive to operate than electric heaters, but installing a standard vent in a house without an existing chimney is expensive. The venting can run either vertically or horizontally with a longer line . Upon generating heat, the air inside the heater becomes hot and rises. b-vent can get hot near the furnace and at the first turn since the average flue temp is about 300 degrees this why 1 inch clearance from combutables is required if you are concerned then call the installer and ask him to check with an analyzer to verify things are working properly There is also the opportunity to retrofit chimneyless (i.e., electrically heated) homes. To Learn More About This Contractor, Click Here to Visit Their Ad in "Find A Contractor". You can also run a manual test. Each vent screen we sell includes one stainless steel clip. Unwrap the flashing from the vent pipe so you can work with it. Single wall vent pipe must meet NFPA 54, section 12.8 which requires the vent pipe be constructed of galvanized sheet steel not less than 0.0304" thick or . If one tankless heater does not produce enough hot water for your home, you can combine more than two units into one system. Similar threads Z He also points out that "a lot of high . Unless the manufacturer says you can pack insulation around the pipe, don't. I don't know about a dryer vent, but for most heaters and woodstoves it is not allowed. This tank is a perfect option for tight construction as this model comes with flexible venting options. Read our articles related to Direct Vent Pipe - written by the top authors in the industry. This is roughly the equivalent of running a bathroom exhaust fan into your furnace's combustion chamber. The comparable numbers for the 103HT standard . Q: I need your advice.My clothes dryer stopped getting my clothes dry. Tankless hot water heaters require special venting to blow hot exhaust gas outside, where it dissipates. The system works solely through natural convectionbased on the principle that hot air rises. High-efficiency furnaces require 2- to 3-inch diameter vent pipes; a nondirect-vent system requires one pipe and a direct-vent system requires two, one to take in the air and the other as an . around 600F, the outer pipe can exceed 200F, which is more than enough to burn your hand, so don't grab hot pipe. The venting system of a direct vent fireplace consists of a double-walled pipe, or pipe-within-a-pipe. Available in 1 Finish. In fact, they are . Every conventional (i.e., non-direct-vent) gas water heater I have seen has a roughly 1" vertical gap between its exhaust port and the exhaust vent (or "chimney"). Clearance distance from gas vent termination cap to adjacent building. An orphaned water heater is one that vents into a chimney flue liner that used to accept the exhaust gas of the water heater and usually a furnace. Direct-vent fireplaces cannot be operated without having this glass sealed in place. The clip fits inside the horizontal intake and exhaust pipes to securely hold the vent screen in place and is hidden from plain view. The hot exhaust gases from a natural-draft water heater rise through an open draft diverter and out through a metal duct. Once inside the chimney, noxious fumes, including carbon monoxide (CO), rise to the top and dissipate into the great outdoors. Now furnaces and hot water heaters are so efficient that there is a different problem - the exhaust air, which you still want to get rid . Additionally, this tank is so quiet you won't even know it's there, with the whisper quiet blower. Clearance to a mechanical air supply inlet. Probably a less heat loss than a window. The direct vent water heater works on the simple principle that hot air rises and cool air sinks. When the weather gets below -30C the vent has a tendency to frost-over. Direct-vent appliances are typically higher in efficiency than b-vent appliances and put out a lot of heat even with a low flame setting. On the other hand, you should always protect your roof vent pipe with a vent pipe cover. Direct vent vs. power vent gas water heaters. Clearance distance from gas vent termination cap to any mechanical air-supply inlet. Direct venting works because the heated air is lighter than cool air and in turn, will rise naturally due to the difference in buoyancy between the hot and cold air. $318.41.