What size of chimney or flue do I need for burning solid fuel? The recommended minimum diameters for stoves is as follows: up to 20kW burning smokeless fuel - Minimum 125mm diameter. - Ed. In some houses it may be possible to install the Wood burner flue through a wall. A 6-inch stove requires a 6-inch flue. Inside measurements of heater are 24 inch wide by 19 inch deep by 18 inch height 24x19x18 inside, Height from proposed collar to ceiling 13feet 4inches through metal roof and insulation 2inches roof has a 1 by 12 pitch.. What size stove pipe do i use and why. For burning coal, coke or wood in a stove, the size of the chimney or flue required will be dependant on the stove choice. Graham please see CHIMNEY HEIGHT & CLEARANCE CODE. The chimney is about 30 feet high. It would be best if you let a trained professional install this for you. There are several other factors responsible for chimney flue size; chimney placement, height, lateral length of the vent pipe, type of the vent pipe, number and type of the connectors along the entire chimney flue run, size and category of the vented appliances… Changing the direction of the venting when you use elbows or a clean-out tee increases the effective length of the pipe. At the very least you need to have a trained service technician inspect, measure, and if necessary adjust the draft and draft regulator for your old Weil Mclain heater. Well, the most important thing to remember is that the flue size must never be smaller than the size of the stove outlet. I took a 20 year old wood heater insert out of my fire place. A flue is a duct, pipe, or opening in a chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors. Continue reading at CHIMNEY FLUE SIZE SPECIFICATIONS_TABLE_C_9_B or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. See CHIMNEY FLUE SIZE SPECIFICATIONS_TABLE_C_9_E. Types of metal chimneys and their properties and fire clearances are at METAL CHIMNEYS & FLUES. With the use of an increaser / reducer, according to the safety codes, you may be able to go up or down one size and your unit should still function appropriately. Historically the term flue meant the chimney itself. Northants Can I safely reduce the outlet from 7" to 6" ? Chimney & flue sizing tables by type, BTUH, building codes, and other factor: This article series describes the size requirements for chimney flues for different categories of heating appliances.  Uniform Mechanical Code - UMC 1991, Sec 913 (a.) Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. Improper gas burner orifices - set perhaps for the wrong fuel, such as mixing LPG and Natural gas set-up procedures ( this could be your trouble), or an improper pressure regulator setting, or improper burner adjustment. Will this reduction affect anything? This is normally when the stove is to be situated against an outside wall. At most masonry chimneys the flue vent connector or "stackpipe" or "smokepipe" is single wall metal, though for fire clearance needs it may be amended to use sections of insulated metal chimneys. However, the interior of your chimney (especially after insulating) may not have the adequate space. We include excerpts from UMC tables along with additional commentary to assist in sizing metal or masonry chimneys according to chimney diameter, height, materials, and the input BTUH of the appliance(s) to be vented. From this pipe, you can connect to either flexible flue liner if going directly through an existing chimner, or to twin wall flue pipe if you need to pass through a wall or ceiling or route your flue pipe externally. Watch out: the first portion of Table C-9-D specifies the maximum input BTUH capacity of any individual heating appliance that is to be vented along with other appliances out through a single chimney. CHIMNEY FLUE SIZE SPECIFICATIONS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. On 2020-02-22 - by (mod) - what causes a direct vent Rais propane stove to over fire? in. Regarding the question below, the oil tech said that it should be OK for our setup. first question-what is the proper gauge for this application and secondly, what size duct do i use as common pipe after wye junction? Some models of single-wall metal flue vents need … A pellet stove needs only a 4 inch pipe. Twin wall flue systems creat a natural draught so unfortunatey you cannot run the pipes horizontally. It’ll force the smoke back into your home because the cold air is more dense. We have all these pipe sizes covered and everything in-between! Single-walled stove pipe is metal pipe of various thicknesses, painted black. (Sept 9, 2011) Graham said:What is the standard height above a tiled roof to the top of chimney ? I never use both at the same time. Do you think this alternate piping might make an improvement? The building regulations say that the flue diameter (or cross sectional area) must not be smaller than the size of the stove outlet, which generally makes great sense. what cause a direct vent Rais propane stove to over fire. The stove pipes are 6" single wall. When you have an insulated chimney liner, this risk is nearly diminished. (Oct 13, 2012) Brent said:I have a single 2650 sq ft home that was once subdivided, one side had a 133,000 btu oil boiler and I have a 115,000 gas boiler. Mary:Thank you for a helpful question: how do I get the required size for the flue vent connector that vents two or more heating appliances into my masonry chimney?To get the correct chimney size (or to see the limitations of what your 8x8" chimney can possibly vent in BTUs, see Not shown anyway in our table (I'll add some data) is that per the AGA NFPA code, if I assume the horizontal flue vent connector distance is 10 feet or less and the chimney height is 30 feet. Are those numbers sufficient for calculating you chimney flue size / diameter? Among the obvious are. Anon I'm sure there are a number of installation, adjustment or maintenance defects that can cause a propane stove to over-fire, and that there are specific defects and serious safety issues that are specific stove type, brand, and model dependent. How to Tell When You Need a Chimney Liner . Hartwell Depending on what kind of stove pipe you use, the Class A chimney pipe must come into the room six inches (for connecting to double-wall stove pipe) or 18 inches (for connecting to single-wall stove pipe). BTU boiler with a 4" draft hood connected to a 20' high chimney is to use a You may need the pipes in your domestic plumbing and heating system insulating. Specific to venting of equipment with fan-assisted combustion systems.  Fire Inspector Guidebook, A Correlation of Fire Safety Requirements Contained in the 1987 BOCA National Codes, (newer edition available), Building Officials and Code Administrators International, Inc. (BOCA), Country Club HIlls, IL 60478 312-799-2300 4th ed. The average stove and furnace today requires a 3 inch diameter pipe, but can go as large as 8 inches. The conversion kitâs contains 4 new nozzles.The stove is preset to provide the correct amount of heat (kW) as described under specifications. Or perhaps you have an industrial oil or maritime application that requires lagging. The total effect depends on several variables including chimney height, ambient temperature range, and oil burner/heater input BTUH and burner adjustments. - additional instructions are on p. 53 Watch out: if this is not your Rais stove model then of course you need to follow the instructions for your specific stove. A. "Rooftop View Turns to Darkness," Martine Costello, Josh Kovner, New Haven Register, 12 May 1992 p. 11: Catherine Murphy was sunning on a building roof when a chimney collapsed; she fell into and was trapped inside the chimney until rescued by emergency workers. As a general rule, the diameter of the chimney should match the flue collar on your wood stove. For open fires with a standard opening up to 500mm x 550mm, the minimum required flue diameter is 200mm round or 175mm square. There is a knock out cemented over that I can use, I would just have to cut an opening into the clay liner. [Note: pending clarification, we have not provided excerpts of Table C-9-G because, frankly, some of its data is confusing. This measurement is usually between 8 … What size stove do I need? Thanks to Luke Barnes for suggesting that we add text regarding the hazards of shared chimney flues. we have a fireplace opening 5feet wide and 30 inches high . Will any other appliances flue pipe be tying into this one? We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. ANSI Z223.1-1988 - NFPA 54-1988. Can a 3" metal flue exhaust into a 6" flue at the roof? in. Metal B-Vent Chimney (Vent) Type of Flue Vent Connector:1, 1.  New York 1979 Uniform Fire Prevention & Building Code, The "requirement" for 8" of solid masonry OR for use of a flue liner was listed in the One and Two Family Dwelling Code for New But an important limit here is the input 7" flue diameter. She check combustion air and will measure draft over the fire, draft in the breech, stack temperature and CO2 or O2. BTU Color Coding Note: in the tables below we use colors to indicate where an example-approximate appliance BTUH vent capacity rating falls across various chimney parameter combinations. Masonry Chimneys, can I safely hook up gas boiler 175000 btu and water heater 75000 btu into 7" round crock on the same flue in a"Y"connection, You have 175,000 + 75,000 BTUH = 250,000 BTUH venting required. On 2016-04-17 - by (mod) - Can a 3" metal flue exhaust into a 6" flue at the roof? I'm burning bituminous coal get smoke billowing out the door when I open it even though I have lots of draft. But before you can think about how great it will look roaring away in the background on a cold winter’s evening, there are some important questions that need answering, and one of the most commonly asked is “what size flue pipe do I need?”. More than that and you need four inch pipe. A flue vent connector is the horizontal/sloped metal pipe connecting the heating appliance to the entry point of the chimney. No, they aren’t! It is possible to get a rough idea of the size you need using the age of your property, insulation levels and the size of your property. WARNING: be sure to check clearances and other safety guidelines in the latest edition of these standards. Good question, Charles. Chimney will be 25'-30' in height when completed. Use conversion kit with article number 3713595 NG to LPG or 3713596 LPG to NG. For example an 8" x 8" square nominal clay chimney flue tile liner has inside dimensions of 6 3/4" x 6 3/4". A stove having a five inch collar (to fit a 5″ pipe) does not necessarily mean that a 5″ chimney liner can be used. I also have a gas hot water heater on the same flue in a "y" connection. Wire bristle chimney brushes are most commonly used and generally do a great job, but are not recommended for metal chimney flues. New York 1984 Uniform Fire Now you need to calculate the effective length of your pipe run. Your chimney height is 30 ft. (which gives good draft). The conversion must only be carried out by an authorised gas engineer. See CHIMNEY FLUE SIZE SPECIFICATIONS_TABLE_C_9_D. 3" venting into 6" is quite an increase. Improper ceramic log positioning could also cause improper gas flame. Before thinking about sharing a chimney flue - generally prohibited as a safety concern but permitted in some jurisdictions, particularly with gas and oil fuels provided proper venting arrangement - I'd check with your local building department about what they permit. With those measurements she can determine if the burner is operating properly.If, after adjusting the draft regulator for your heater she cannot obtain sufficient draft for your heater it might be necessary to add a draft inducer fan. Building and Fire Prevention Code:  "Top Ten Chimney (and related) Problems Encountered by One Chimney Sweep," Hudson Valley ASHI education seminar, 3 January 2000, contributed by Bob Hansen, ASHI. I'm going to install a clay lined brick chimney in my 2 story home for a wood burning stove! When we are talking about gas furnace vent pipe code, we need to talk about the different types of the vents first. But chimney experts and draft measurements show that in a rectangular flue not all of the cross-sectional area is equally effective in developing draft. At double-wall B-vent chimneys the flue vent connector between the appliance and the chimney entry point may be single-wall metal flue vent connector or it may be a double-wall Type-B flue vent material. The maximum vertical run of three inch pipe is usually fifteen feet. See CHIMNEY CROSS SECTION SHAPE EFFECTS for the effects of square vs round chimney sectional areas. This pipe gets super hot, so it you use single wall stove pipe you'll need to keep it at least 18 inches away from walls, drapes or anything combustible. Note that different chimney sizes are required for venting fireplaces and woodstoves. 11 Forest Road This two-part table gives the chimney specifications for the total input BTUH of all of the appliances combined and joined into a single vent when the flue is a masonry chimney and when the flue vent connector (between the appliance and the chimney entry point) is a single wall metal component. If you're looking for more information on flue pipes, or a potential stove that you may be interested in. In most cases, a step up is also fine. So if a stove manufacturer states that the stove requires a flue diameter of 7″, then a 7″ liner must be fitted. 150mm (6 inch) Buy Online, Call, or Collect. Home; Trade login; My Account; Recent Orders; Total: My Cart. Just muliplying these dimensions together (6.75 x 6.75) = 45.56 sq.in. CHIMNEY FLUE SIZE SPECIFICATIONS_TABLE_C_9_D, CHIMNEY FLUE SIZE SPECIFICATIONS_TABLE_C_9_E, CHIMNEY FLUE SIZE SPECIFICATIONS TABLE C-9-F, CHIMNEY FLUE SIZE SPECIFICATIONS TABLE 504.2, Rais QTEE-II gas stove for which you can read the RAIS QTEE GAS STOVE MANUAL, CHIMNEY FLUE SIZE SPECIFICATIONS_TABLE_C_9_B, CHIMNEY FLUE SIZE SPECIFICATIONS_TABLES C9_C, InspectAPedia.com/chimneys/Chimney_Inspection_Repair.php, HOME INSPECTION EDUCATION COURESES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, Minimum Input BTUH, Single appliance, natural gas, B-vent connector vs chimney height, size, & outdoor temperature. For open fires with a standard opening up to 500mm x 550mm, the minimum required flue diameter is 200mm round or 175mm square. We have no relationship with advertisers, products, or services discussed at this website. chimney (assuming that's *internal* area, falls between two standards: a 78 sq. Generally a larger vent is functional and safe as long as the chimney size and height are not so large that the heating appliance won't develop adequate draft. Click to Show or Hide Citations & References. Property ages are given across the top and they assume standard insulation measures, such as double glazing and loft insulation, have been made. calculation using a 38,000 BTU water heater with a 3" draft hood and a 37,500 An experienced installer will be able to provide advice and general guidance on the selection of stoves, flues and accessories, but it’s always best to make sure you do your homework too, and ensure the professional you choose is certified and conforms to the relevant regulations and standards. Too small OR too large a flue can make venting difficult and even unsafe2.  GAMA - what size flu do we need. Apologies for the delay. What type gas are you using? Aside from the fact that you don’t need to worry about trapped toxic gas, you don’t have to worry about fire. Yes, Flue, going to a smaller diameter main flue in a chimney may reduce the draft. Measure the diameter of the exhaust pipe leaving your hot water heater. Discovering what size pipe to buy is simple. You don't give the horizontal distances of your 7" flue vent connector(s) between the appliances and the chimney, nor do you say if the appliances are natural draft or forced draft, so we don't have the total answer to your question, nor am I confident commenting on "safety" for an unknown system since a mistake can be fatal. Your stove pipe should match the size of the collar on your wood stove. Even with double wall stove pipe there has to be a maintained clearance of 6’’. Here is a quick guide to the UMC's chimney sizing & BTUH venting capacity tables when sizing a metal or masonry chimney diameter to match the total input BTUH of the heating appliances (boiler, furnace, water heater) being vented. He will come out at some point to adjust the draft if needed. David I don't quite understand the question. Permission may also depend on the chimney type and design. If you have a minimum of 18’’ then you will be safe to use single wall stove pipe. the additional flue outlet. While the correct size flue is of course extremely important, there are many other factors you need to consider prior to the installation of your stove, such as insulation, chimney position, bends, connection, pots and terminals. In the United States, they are also known as vents for boilers and as breeching for water heaters and modern furnaces. Watch out: also Important are the heating appliance manufacturer's installation instructions A gas wall heater or older forced-air furnace generally requires a type "B" double wall metal vent pipe, while a new high-efficiency furnace requires a schedule 40 PVC vent pipe. I stuck 2 old elbows in to prove to myself that I have room to rearrange the pipe, you can see them in the pic. If it is a 3-inch-diameter pipe, the inside cross sectional area of the chimney flue liner should not exceed 49 square inches. For larger open fires like Inglenooks which operate with a fire opening greater than 500mm x 550mm, the flue size should be at least 15% of the free unobstructed area (including the sides if open). Calculating Your Pellet Stove Venting Size. Single walled enamelled stove pipe should only be used internally. After that, add any height needed above the chimney chase for a storm collar and chimney cap. in. I'm thinking it may be due to the way it has been piped causing a limitation in flow.