We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. Intake and Exhaust Pipes •PVC allowed (140°F limit) •Furnace/Water Heater/Boiler Manual –Size of pipe and allowable lengths (support) •Terminations –Through wall or through roof –12” above grade or anticipated snow level –In same pressure location –Concentric venting kit 25 Flue vent connectors, also called smoke pipe, stack pipe, or flue pipe by some people, are typically single-walled metal pipes connecting a heating appliance to a chimney, vent, or flue. Be sure to obtain the latest edition. Only FGV (flue gas vent) PVC certified to a specific standard (ULC S636) may be used. No we don't use a single-wall flue vent connector at a typical gas fireplace, nor do we usually vent that fireplace type into a conventional chimney. If pipes do sag, condensate can accumulate in the areas where the pipe is sagging, restrict the airflow and cause the furnace to shutdown in a lockout safety mode or create a pool of liquid that adds moisture to the air being vented to the outdoors. Can the screen mesh area around the flue at the ceiling level be sealed/closed off and not affect the performance of the heat/air unit? The vent pipe, or flue, is a vital component of the furnace that transmits emissions from the combustion process out of the building. Apologies for the delay. If left uncorrected, these risks may impact proper operation of the equipment or create an unsafe environment for the occupant. Ms. Puentes can be contacted at, NFPA 211 - Standards for Chimneys & Fireplaces, NFPA 211: Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances, 2006 Edition (older editions and standards are found at the same bookstore). Booklet. 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. If there is a cooling coil there'll also be an outdoor compressor/condenser unit.The coil will be on the outlet or "supply" side of the air handler. I figure that if there is 6-8" of clearance in width by several feet in length for air movement, I'm not obstructing air flow and the room will heat (or cool). Masonry flue or shared flue venting: Where the system is routed to the outdoors through an existing masonry chimney containing flue products from another gas appliance, or where required by local codes, then 3" venting of Type 29-4C stainless steel must be used in place of PVC material. All air filters must be listed as Class 2 furnace air filters. Gas-fired heating equipment: fire clearances required range from 6" to 36" depending on the equipment. I'm wondering how far furniture needs to be from the heat vents in a room for safety sake? - Goodman MVC96/CVC96 Direct Vent manual cited below Pyrolysis, the process and temperatures under which wood deteriorates and becomes more readily combustible explains why fire clearances between flue vent connectors and nearby wood framing or other combustibles is very important. You may need to clear or refresh your browser cache to see the updated page. Note: this document is reissued every four years. 10. The most common variables for which the flue must be sized are Btu capacity of the furnace, the horizontal and vertical length of the flue, and the number of elbows and type of vent connector (the part of the flue that connects the furnace to the main flue pipe). ANSI Z223.1-1988 - NFPA 54-1988. Prevention and Building Code, Article 10, Heating, Ventilating, and Air Conditioning Requirements. This opening in the ceiling allows a hot and cold air draft flow into and out of the interior of the closet area along with considerable amount of attic debris. Appliances having an ignition source shall be elevated such that the source of ignition is not less than 18 inches (457 mm) above the floor in garages. Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. Had the insurance inspector in my home and they are telling me it needs to be checked as the distance isn't enough.. The furnace is provided with flanges for the connection of the plenum and ducts. Condensing furnace venting: American Gas Association has certified the design of condensing furnaces for a minimum of 0" clearance from combustible materials with a single wall plastic vent pipe. It can act as a bottleneck and function to restrict toxic gas venting. Is that dust dryer lint? Although the furnace has been there since the house was built and I have had technician in there before for regular maintenance and no mentioning of this.. Apologize George but it's difficult to diagnose the system when we can't see it and know nothing about it. My OPINION is that ... it depends. In general one can cut and repair ductwork for various reasons. Crawl space installations: The furnace may be placed horizontally in a crawl space on a pad or other noncombustible material which will raise the unit for sufficient protection from moisture. Because there are definite fire and explosion hazards you should be sure that any final design you have in mind it's approved by your local building or fire inspector. This section lists the applicable code requirements followed by details helpful for plan review regarding the provisions to meet the requirements for "oil-fired boilers." This book provides a valuable guidance tool for chimney and stack inspections and also offers a set of references for these particular inspections. by Sherry Laible-White. For the purpose of this section, rooms or spaces that are not part of the living space of a dwelling unit and that communicate with a private garage through openings shall be considered to be part of the garage. Heating, Ventilating, and Air Conditioning Volume I, Heating Fundamentals, The ABC's of Retention Head Oil Burners, National Association of Oil Heat Service Managers, TM 115, National Old Timers' Association of the Energy Industry, PO Box 168, Mineola, NY 11501. Photo (above right) shows a 4 1/2" (unsafe) distance between an oil-fired heating flue vent connector and wood framing. According to the International Code Council, clearance area for this type of oil furnace venting is nine inches. For a more complete listing of clearances by gas-fired appliance type see the table of Listed Flue Vent Connectors for Gas Fired Heating Appliances found. 9. Sorry. In that case a heat shield may be approved by a fire inspector and may reduce clearance. Traditional gas-fired, forced-air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes, or chimneys. 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. I added a pair of red arrows pointing to the mechanical connections of the heat shield to the wood-framed floor above the flue vent connector in your photo. Each chimney or stack is a unique structure, subject to both aggressive operating and natural environments, and degradation over time. Uniform Mechanical Code - UMC 1991, Sec 913 (a.) ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. For example, here in Canada Schedule 40 PVC DWV (drain PVC) may not be used. The greater Instructional Technologies Institute, Inc., 145 "D" Grassy Plain St., Bethel, CT 06801 800/227-1663 [home inspection training material] 1987. Galvanized flue pipes must not be used because the coatings vaporize at high temperatures and release dangerous gases. [8] National Fuel Gas Code (Z223.1) $16.00 and National Fuel Gas Code Handbook (Z223.2) $47.00 American Gas Association (A.G.A. Code, BC Building Code, and the BC Safety Authority4 for further information on health and safety regulations related to furnace installations. Based on design of house I would like to just enclose the utilities (natural gas heater and hot water tank) vs a huge room around the equipment to minimize explosion risk from accidental gasoline leak. 11. 6-, 7-, and 8-inch diameter flue pipes must be at least 24 gauge in thickness. Sketch (above left) courtesy Carson Dunlop. NFPA #211-3.1 1988 - pressure and with a vent gas temperature less than 140° F above the dewpoint. It's not just space but you would have achieved by the design that you proposed you would also have hot metal in contact with combustible materials. The angle iron needs to be at least 32" in length to allow for access to service panels. Oh I forgot to mention, the furnace doesn't have any information on the outside to tell me what the distance should be :(. If so, then a combination of housecleaning and an inspection of the dryer for dust and lint leaks is in order regardless of the dryer's exact placement.Two feet more or less distance change from a clothes dryer that's leaking lint would not make one iota of difference in safety.So where is the issue with clothes dryer distance to the gas furnace?The answer is working space or fire clearances from combustibles that will be specified in the gas furnace installation manual for your specific heater. A mistake can result in a fatal fire. What is the IL Code law for distance, putting an outside heating/AC unit between two residential houses? Clearance is measured from "combustible material" inside the fire-rated wall or ceiling. Heather:The two worries, I suspect, nagging at your maintenance guys were1. re: clothes dryer location vs gas furnace clearance distances. Garage installations: Furnaces installed in a garage must place burners & ignition source no less than 18" above the floor & furnace must be protected from physical damage from vehicles. The space surrounding a flue lining system or other vent installed within a masonry chimney shall not be used to vent any other appliance. There will be a point where these factors counter-balance the momentum of the flue-gases. This shall not prevent the installation of a separate flue lining in accordance with the manufacturer's installation instructions and this code. can a single wall flue exposed for gas fireplace up to safety thimble and then b vent through roof? refers to Chapters 23, 29, and 37 of the Building Code. See DIRECT VENTS / SIDE WALL VENTS for a complete table of recommended clearance distances from a direct vent gas appliance terminal to other building components or features. Category I draft hood equipped central furnaces as well as fan-assisted Some fire experts warn that nails or screws through a heat shield may conduct heat through to combustible materials, thus reducing the fire-safety-effectiveness of the heat shield system. 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'd be glad to help, anon but have not a shred of information; perhaps you intended to post a photo ( 1 per comment). Below: heat shielding has been installed to reduce fire hazard and improve fire clearance above a flue vent connector for a basement or crawl space furnace. Click to Show or Hide Citations & References, FIRE CLEARANCES, SINGLE WALL METAL FLUES & VENTS, FLUE VENT CONNECTOR FIRE CLEARANCE: OIL FIRED EQUIPMENT, FLUE VENT CONNECTOR FIRE CLEARANCE: GAS FIRED EQUIPMENT, FIRE CLEARANCES, SINGLE WALL METAL FLUES & VENTS FAQs, CHIMNEY CLEANOUT CLEARANCE to COMBUSTIBLES, FIRE-BLOCK Fire Retardant Foam Spray Building Insulation, InspectAPedia.com/chimneys/Chimney_Inspection_Repair.php, HOME INSPECTION EDUCATION COURESES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, Whether or not there is an air space above the heat shield, allowing for reduction in heat transmission through the heat shield as well as for cooling of the connectors, The length of the screws or other fasteners and thus the distance between the inner-side of the heat shield and the nearest combustible material. These furnaces have been classified as CATEGORY IV furnaces in accordance with the latest edition of ANSI Z21.47 • CAN/CGA- 2.3 Standards. This is important because an 80% furnace will put out exhaust at about 500 degrees Fahrenheit through the flue pipe. The basic concept has more than just ventilating the area it is that you need to provide enough combustion air for the equipment in the enclosed space. All piping must be installed in accordance with local codes and these instructions. Always check your local/state/province codes and regulations. 41-5016-07, 2. Oil-fired heating equipment: Unless we have different explicit guidance from the manufacturer of an oil-fired heating appliance being vented, we want to see at least 18" of clearances between the flue vent connector and the nearest combustible surface. Anon:The "coil" in a furnace is usually a cooling coil used when the air handler is providing both heating and COOLING to the home. A metal flue pipe is built to withstand that level of heat and won’t melt, but the plastic PVC pipe is not. The mesh design allows an open, back and forth air flow from the interior heating/air unit closet into and from the attic area. Fireplaces, a Practical Design Guide, Jane Gitlin, Fireplaces, Friend or Foe, Robert D. Mayo. They might miss a chance to sell you a lint filter that you not only don't need, but that depending on the type and installation might itself be a serious fire hazard.If your clothes dryer is properly and safely vented to the building exterior, the release of lint around the dryer itself ought to be minimal and not a safety hazard.Start with a practical examination: is there dust visible in, on, or around your gas fired heating equipment? Vent pipe that is too small in diameter will not adequately exhaust flue gases to the outside atmosphere. SharonI think you're asking about the furnace exhaust vent clearance distance from the wall termination or vent cap to other surfaces or obstructions.That distance depends on a number of factors such as fuel (gas vs oil), and also the manufacturer's specifications.I have never seen an Installation/Operation manual for a direct vent heater that did not include a sketch showing required clearance distances.But if really your heater's manual (please give us the brand and model furnace so we can take a look too) omits that data, seeGAS APPLIANCE DIRECT VENT CLEARANCES Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. Are there different grades of non combustible shield material? The added moisture to air being discharged during winter can contribute to ice accumulation. If that damage results in a crack or hole the heat exchanger could leak fatal carbon monoxide into the building air.That scenario is possible, though unlikely.So in sum, the main concern with furniture too close to the heating vents is blocking heat from entering the room.Using a couch whose back parallels a wall for example, I keep the couch 8" away from the closest edge of a floor or wall heating supply or return air vent. See FIREPROOFING ASBESTOS SPRAY-ON for details. The house has been through at least 3 inspections before and this has not been an issue. Continue reading at PYROLYSIS EXPLAINED or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. Principles of Home Inspection: Chimneys & Wood Heating, in (Principles of Home Inspection), NFPA 211 - 3-1.10 - Relining guide for chimneys, NFPA 211 - 3-2 - Construction of Masonry Chimneys, NFPA 211 - 3-3 - Termination Height for chimneys, NFPA 211 - 3-4 - Clearance from Combustible Material, NFPA 54 - 7-1 - Venting of Equipment into chimneys, Brick Institute of America - Flashing Chimneys, American Gas Association - New Vent Sizing Tables, Chimney Safety Institute of America - Chimney Fires: Causes, Effects, Evaluation, National Chimney Sweep Guild - Yellow Pages of Suppliers.

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