piping for vent. Transite generally requires 1 to 3 inches depending on various factors. The ideal vent pipe diameter also directly depends on the total distance between the exhaust outlet on the furnace and the exit point on the wall or roof. The most typical sizes of tankless vents are 3" and 4". M1505.1 General. 1. The use of plastic venting systems on gas fired water heaters, furnaces and boilers has undergone a significant change. A typical requirement is 1 square inch per 1,000 BTUs of input for an unobstructed opening. Vent pipe must be either 2" or 3" in diameter, depending upon furnace input, number of elbows, length of run and installation (1 or 2 pipes). If left uncorrected, these risks may impact proper operation of the equipment or create an unsafe environment for the occupant. Check local code requirements regarding the use of PVC pipe. • Air filters must be replaced upon construction comple- tion. Only One Vent Kit per each Furnace Allowed. A complete parts list for the venting system design or venting system. Ensure adequate clearance between piping and other structures. Further requirements for our own particular model of pellet stove for fresh air venting include: Using a protective grid where the vent meets the outside air, if required. PVC piping straight up for 20 inches before turning it towards the exterior wall. In some instances additional clearance may be required. with the existing furnace, verify correct vent terminal clearances to doors, windows, and outside air intakes per code and manufacturer requirements, and inspect for deterioration of existing systems. use these instructionsfor installation of the concentric vent termination kit.read these instructions completely before attempting installation.field supplied pipe and fittings are required to complete installation.note: all pipe, … Generally, the sizing requirements depend on the type of furnace (natural venting or fan-induced) and the size of the furnace in BTUs. Connect this furnace to an approved vent system only, as specified in the Venting section beginning on page 5 of these instructions. shabby wrote: ↑ There's no way a licensed gas fitter/hvac installer is going to leave old abs pipes connected to your new furnace. In Canada, all plastic pipe must be listed to ULC S636. As the name implies, hot exhaust fumes from the furnace rise naturally up the pipe and vent through the rooftop. 2. Victoria-05. Metal vents that are too close to wood or combustionable materials may cause the wood to burst into flames. Direct Venting • Requires vent/ flue pipe only. Installation Instructions Rigid and Flex Pipe Venting Systems 5673 654 - 10 08/2020 for use by heating contractor Vitocrossal 300 CU3A Models 26, 35, 45, 57, 94, 125, 160, 199 5. This high efficiency venting system must be installed when you install the new furnace. Very restrictive to flow, this design accounted for 10 equivalent feet of 2 in. Despite the confusion, the safe practice would suggest the use of PVC schedule 40 pipes for the air intake vent on the furnace and CPVC for the exhaust flue vent, given its higher service . for a gas fireplace exhaust termination cap, 3 feet (91cm) within a height of 15 feet (4.5m) above the meter / regulator assembly 3.b. Jerico. Typically for gas furnaces there must be a minimum of 24" front accessibility to the furnace, and any access door or panel must have enough clearance space to permit removal of the largest component in the equipment. PVC/ SRD fittings may be used. If you are unsure what vent pipe your furnace uses, check the manufacturer's specs. Adequate clearance must be provided around the vent-air intake terminals. Triple-Walled: Triple-walled, obviously enough, consists of 3 pieces of metal and requires zero clearance. The vent pipe of your gas furnace plays an important role by carrying all toxic gases created during the combustion within the furnace out of the building. The clearance shall be not less than the clearance to combustibles specified by the vent manufacturer's installation instructions. March 7, 2014. for a gas fireplace exhaust termination cap, 3 feet (91cm) above - if within 10 feet (3m) horizontally 4. In this system, often referred to as a direct vent installation, one of the PVC pipes draws in fresh outdoor air to feed to the furnace's combustion. 4. Floor Furnaces Decorative Gas Appliances DuraVent Type B Vent Systems may be used on other gas-burning appliances, provided the manufacturer of the appliance states in their installation instructions that Type B-vent is acceptable. Always consult the manufacturer or read the manual for venting sizing requirements for the specific model being used. Currently have an 84k in/64k out furnace so an 80k in 80% unit = 64K out. Do not use Schedule 40 PVC or use couplings to extend pipes. Which 90 per cent AFUE furnace brand got into Canadian basements first? Observe all clearances listed in vent clearances in these instructions. Vent pipe must be either 2" or 3" in diameter, depending upon furnace input, number of elbows, length of run and installation (1 or 2 pipes). The manufacture even stamps this into the vent. Warm-air Furnaces shall not be installed outside a building unless listed for exterior installation or enclosed in a waterproof housing. Gas vents of 12 inches or less in size and at least 8 feet away from a wall must terminate at least 1 foot above the An oil furnace using L-vent for exhaust can cut the clearance to combustibles in half to 9 inches. This method is also known as horizontal or sidewall venting. Determine the best location for the Concentric Vent. What type of PVC is used for venting? Venting for high-efficiency gas furnaces - Materials. System A (12-inch clearance): A 3.5-inch-thick brick wall shall be framed into the combustible wall. Manufacturers express venting requirements as square inches of net free air. Connect this furnace to an approved vent system only, as specified in the "Venting Requirements" section of these instructions. As the name suggests, wall venting is any gas furnace venting configuration where the vent(s) terminate through an exterior wall. Two cases which can cause poor venting are the oversizing of the vent or reducing the . Here are some of the venting types: 1. Any pipe size change must be made outside the furnace casing in a vertical pipe section to allow proper drainage of condensate. Examples of such situations are as follows: Raising of appliances, necessitated by floors being elevated during renovations. Installation Instructions Installation Requirements Table 1: Vent and Air Piping Materials Item Material As direct vent central forced air furnaces with all combustion air supplied directly to the furnace burners through a special air intake system outlined in these instructions. • The return air duct must be provided and sealed to the furnace. LOCATION AND CLEARANCES The location of the furnace is normally selected by the ar-chitect, the builder, or the installer. (B) Up to and including 90 C (190 F) This temperature limit was intended to allow the use of CPVC pipe for use as a flue gas material. M1401.4 Vent and air pipe minimum length 1. Trim back the wood, shift the vent or …. of the vent plus the furnace input and efficiency are factors affecting the temperature of the flue-gases. Both the combustion air and vent pipes must attach to the vent kit. Termination should be positioned where vent vapors are not objectionable. 3. Building Science Corporation. • Air filters must be installed in the system and must be maintained during construction. Shifting of appliances . When the manufacturer of a Product Approved side wall horizontally vented gas fueled equipment does not provide the parts for venting the flue gases, but identifies "special venting systems", the Some have 0" some have 1/2" and others have 1" clearance around combustibles also some say do not insulate as the temperature will damage the pipe and some say to insulate if it passes through a unheated space others say only leave the first 3ft exposed and must be CPVC. Adequate clearance must be provided around the vent-air intake terminals. Then PVC, CPVC and polypropylene flue gas piping can be safely used on high efficiency boilers and water heaters. This leaves enough room for a 2" waste vent line and a roughly 2" air gap if I were to run the vent line by the wall next to the chimney. This can make going through a combustible wall and venting out the chimney possible. Fig-Vent and air pipe diameters can be as specified in ure 2, page A-4. SDR-26 PVC (D2241) only may be used for extendingpipes. If the unit is vented to the outside then it needs 12 inches of clearance from a door or window. An induced draft fan typically . Domestic open-top broiler units shall be provided with a metal exhaust hood, not less than 28 gage, with 1 / 4 inch (6 mm) between the hood and the underside of combustible material or cabinets. Requirements Clause 8.9.6 of CSA B149.1-10 requires plastic vents to be certified to ULC S636 "Standard for Type BH . Clearance must be in accordance with local installation codes and the requirements of the gas supplier 3.a. Combustion products must be discharged outdoors. Furnace vent pipe connections are sized for 2" (5.1 cm). 2″ PVC leaves the furnace, increasing to 3″ for the remainder of the flue. Do not exceed vent and air piping MAXIMUM lengths given in Figure 2, page A-4. Then using system 636 PVC glue and primer if doing it in cold weather, glue a system 636 PVC elbow onto the end of the termination so that it is blowing the exhaust straight away from the house. Most of the double wall stove pipe allows for 6" clearance from wall combustibles and 8" from ceiling combustibles. I already have a type B vent for furnace and water heater. diameter pipe systems (See Figures 3, 4, 5, and 6 for the different applications.) DO NOT operate unit until venting is completely installed and all solvents and glues have bonded. 3. Info-606: Placement of Intake and Exhaust Vents. . EXCEPTION: Direct vent furnaces, enclosed furnaces and electric heating furnaces. An exhaust vent can be metal or PVC, but what kind of unit will determine which you can use. Manufactured and supported by PVC & CPVC piping system experts; Installer training available. Adequate clearance must be provided around the vent-air intake terminals as specified in the Venting section beginning on page 5 of these instructions. INSTALLATION: I began the installation of the new vent flue by purchasing schedule 40 PVC pipe in 2″ and 3″ diameters. In a great majority of cases, plastic piping is used to vent high-efficiency equipment. Other Aspects of High Efficiency Furnace Venting It also shouldn't cost $600, 10 foot pipe is $26 in home depot, add some elbows and glue and its maybe $50-75 in material. pvc is combustible, b-vent requires a 1" clearance from combustibles typically the furnace intake and exhaust have to be on the same wall, and the manufacture will prescribe rules of the required separation between the combustion air intake and the vent.did not want to put this info out thinking it was DIY. 2. Direct - or through-the-wall - venting of oil fired heating equipment is becoming a major discussion topic in the oil heat industry. The length of the clean air vent should not exceed 1m. Gas Equipment under 400,000 BTU/hr: Tankless Water Heater Vent Clearances. (d) MANUFACTURER REQUIREMENTS − GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED. In a great majority of cases, plastic piping is used to vent high-efficiency equipment. "A direct vent appliance with an input of over50,000 Btuh shall have at least a 12-in. Use 3 to 6 watt per foot at 115 volt, 40 degree F self regulating shielded and waterproof heat tape. This month we will look at direct venting and its benefits and drawbacks. . Unless your furnace is older than the 1980s, you are . 4 Install this furnace in accordance with the American National Standard Z223.1 - latest edition entitled "National Fuel Gas Code" (NFPA54) and requirements or . Metal single wall generally requires 6 inches of clearance 2. August 24, 2018 By Ian McTeer. The supervising licensed (Master or Journeyman) Plumber or Gasfitter has secured a gas fitting permit in compliance with 248 CMR 3.00. It is permissible to alter existing ABS venting system terminations with S636 approved PVC or CPVC venting components using appropriate S636 transition cements. Do not use Type B Vents for Category II, III, or IV gas appliances. 2. Direct venting systems eliminate the need for a chimney. A double-wall or dual vent pipe consists of 2 layers of metal and requires a 1-inch clearance. If the furnace environment has the potential for freezing, the drain trap and drain line must be protected. It is classified as "Type BH" venting. Combustion products must be discharged outdoors. If the vent pipe is properly installed, meaning the proper materials used (typically schedule 40 PVC pipe), all the pipe joints properly sealed with PVC primer and glue, and all the vent pipes back pitched so that any condensation build up or water from the top of the vent pipe will all drain back down the vent through the fan and into the . 2. Inadequate clearance from combustibles at the gas vent stack for the furnace at the drywall and wooden structural components. The typical vent installation of the tankless indoor water heater is horizontally through the sidewall or vertically through the roof. All PVC/CPVC exhaust vent material used in Canada must be S636 certified. • PVC must extend a minimum of 12" above the top of the chimney. On the other hand, the higher the efficiency of a furnace, the lower the flue-gas temperature. Many think stovepipe can run from the wood-stove, right up through the ceiling and roof. above grade." National Fuel Gas Code 10.8.4 • PVC may be run through and existing unusedchimney. The challenge of Category IV gas-fired appliance venting. A clearance of at least 24 inches (610 mm) shall be maintained between the cooking surface and the combustible material or cabinet. 6. Wrap the drain trap and drain line with the heat tape and secure with ties. Its a Ruud and I had a problem with the furnace starting when the temp got to about -20F. Venting for high-efficiency gas furnaces - Materials. 5. may be through a closet. When venting heaters, don't guess. 1. In this case, hot water tank venting must be evaluated after the new furnace is installed to determine whether venting changes are required to accommodate an 'orphaned' domestic hot water tank. Metal Double wall / "B" vent requires 1 inch minimum clearance 3. be dependent on the existing furnace system for venting. Higher BTUH furnaces produce higher flue-gas temperatures. Connect this furnace to an approved vent system only, as specified in the "Venting Requirements" section of these instructions. That would require running the running the exhaust ~30' so it can exit at the back of the house. • Look at the gas vent pipe termination. This may be field modified by cuttingor extending both the intake and exhaust pipes. Also known as Type B, this vent is operating on natural air convection. Determine correct Concentric Vent size for the pipe diameter selected. Do NOT install the furnace in a corrosive or contaminated atmosphere. Each appliance has a 4"vent and they share a 6" pipe out the roof. Partially assemble Concentric Vent kit. Vent and air pipe maximum length 1. Cut away the wood that's too close 2. 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. pipe. • PVC may run horizontally and exit through the side of the building or run verticallyand exit through the roof of building. pipe. It is permissible to alter existing ABS venting systems with S636 approved PVC or CPVC venting components using appropriate S636 transition cements. A licensed (Master or Journeyman) Plumber or Gasfitter shall be responsible for and supervise the installation performed by such qualified individuals, and; b. One person who gave me an estimate said that the exhaust must be at least 15 feet from any other building. Cut a 4" diameter hole for CVENT-2, 2" kit. • Look at the gas vent pipe termination. • PVC must extend a minimum of Gas vents of 12 inches or less in size and at least 8 feet away from a wall must terminate at least 1 foot above the Use furnace installation instructions to determine pipe diameter. Each type of vent pipe has recommended clearances to combustible materials 1. There is a roughly 4" gap between a brick chimney (which provides the exhaust for my furnace and hot water tank) and one of the walls all the way to the attic. However, furnace vent pipe requirements vary for . The optional Combustion Air Pipe is dependent on installation/code requirements You should know how to vent a gas furnace and get rid of the harmful gases, for the health and safety of anyone living in your building. Natural or "type B" vents are the most common and economical option used with gas furnaces. The clearance between gas vents and combustible materials is listed by the manufacturer, but is typically 1 inch for Type B. Examples of such situations are as . The optional Combustion Air Pipe is dependent on installation/code requirements This is usually referred to as the air-intake pipe, or simply the intake pipe. Posted: Sat Oct 03, 2009 2:15 pm Post subject: Re: Insulating PVC furnace vent pipe: I have a 90 plus furnace that has 3.0" pvc pipe installed on both the intake and the exhaust and its reduced to 2.0" at the furnace and where it exit's & enter's the house. Two-pipe venting is often preferable, especially in modern houses that are extremely airtight. Then, I do not have to drill any new holes in . Direct Venting Of Oil Fired Appliances. Due to the condensing nature of a high-efficiency furnace, its venting must be made of a material that is resistant to corrosion. When the vent is withdrawing air from the house, it expels the gas outside through the vent. Newer high-efficiency furnaces vent through the wall. Ventilation system intakes must be sufficiently separated away from potential contaminant sources, and locations of dust and debris. • Return air temperature range between 60°F (16°C) and 80°F (27°C) must be maintained. clearance between the vent pipe and the insulation. Info-606: Placement of Intake and Exhaust Vents. 1 This is the dimension as shipped. follow the furnace installation instructions for locating the furnace,clearances, operation and safety procedures. Then cut a 6" piece of system 636 2" PVC pipe and glue that into the elbow to help throw the exhaust further away from the structure. I'd replace the furnace with a variable or modulating unit of the same size so the vents will work as-is. the furnace space as specified in the "Venting Requirements" section of these instructions. An .625-inch-thick fire-clay liner (ASTM C 315 or equivalent) e shall be firmly cemented in the center of the brick wall maintaining a 12-inch clearance to combustibles. Vent kit is for 2, 2-1/2 or 3 in. These PVC pipes are connected to the furnace and expelled outside. DO NOT use PVC/CPVC on Non-Condensing Units. L-vent is used primarily for oil-burning appliances and isn't recommended for gas, whereas B-vent is primarily used for gas and can't be used for oil. Follow furnace Building Science Corporation. Is the location selected as near the vent and as . These can include hot water tanks and other equipment related to the home HVAC system. If installing a vertical venting system through any unconditioned space such as an attic or crawl space, it must be insulated. IMPORTANT Type B Vent shall not be used to vent flue Single wall vents should have a minimum of 6 inches of clearance and double wall, sometimes called a "B" vent, should have 1 inch minimum clearance. It is classified as "Type BH" venting. The temperature limit for PVC pipe is 140 F, and the allowable temperature in the ULC S636 standard exceeds the temperature limits set by PVC pipe manufacturers. Venting Requirements for Tankless Water Heater. CSA B149.1 Natural Gas and Propane Installation Code now requires all special venting material to be certified to ULC S636 across . If the window does not open, the tankless water heater . .A zero-sweep PVC elbow often used in the non-certified old days. Covering non-metallic vent pipe and fittings with thermal insulation is prohibited. Ventilation system intakes must be sufficiently separated away from potential contaminant sources, and locations of dust and debris. 1. If a pro does it, the cost will easily be 200-300 bucks. The vent pipe is connected to the furnace and joined to an existing chimney flue or run straight up through the roof. Mechanical sealed combustion equipment intake should also be located away from likely sources of dust and debris. 12" is the minimumallowable length and 60" is the maximum allowable length for thisdimension. Access to furnaces located in an attic or under-floor crawl space . Type B gas vent (Section 503.6) Chimney (Section 503.5) Single-wall metal pipe (Section 503.7) Listed chimney lining system for gas venting (Section 503.5.3) Special gas vent listed for these appliances (Section 503.4.2) Listed vented wall furnaces: Type B-W gas vent (Sections 503.6, 608) Category II, Category III and Category IV appliances The vents are connected to a vent adapter that comes with the unit. The vent kit must terminate outside of the structure and should be installed vertically as shown in Figures 3 and 4, or 4. The bottom of the ventterminal and the air intake shall be located at least 12 in. Due to the condensing nature of a high-efficiency furnace, its venting must be made of a material that is resistant to corrosion. a. The clay liner shall run from the outer surface of the bricks to the inner surface of the chimney liner. Combustion products must be discharged outdoors. Using a "Heat Shield" on a single wall stovepipe allows you to reduce the clearances from 18" to 6" to the wall and 9" to the ceiling. Natural vent. Proper venting is essential on all types of furnaces used to heat homes in order for the appliance to run efficiently and to keep your family safe. Requirements for metal gas vent pipe terminations are described in the local building code. Natural Vents. For clearances not specified in ANSI 223.1/NFPA 54 or CSA B149.1, one of the following shall be indicated: a) A minimum clearance value determined by testing in accordance with section 2.20, or b) A reference to the following footnote: "Clearance in accordance with local installation codes and the requirements of the gas supplier." the furnace space as specified in the "Venting Requirements" section of these instructions. The PVC pipes are used for air intake, exhaust gas, and to remove the corrosive condensation resulting from the combustion process. This structure generally uses the furnace vent pipe through roof because the B venting pipe is designed in a vertical manner. However, before the furnace is moved into place, be sure to consider the follow-ing requirements: 1. Direct vent — vent pipe and air pipe must each be at least 2 feet It is recommended that pipe and fittings are installed at least 1 inch from the supporting structure. clearance between the vent pipe and the insulation. get a power vented water heater. NOTE: The use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel® (polyphenolsulfone) in non-metallic venting system is prohibited. Please refer to the linear expansion tables (Figures 1 & 2) to help determine if extra clearance is necessary. March 7, 2014. Requirements for metal gas vent pipe terminations are described in the local building code. Where vents pass through attic space, the shield shall terminate not less than 2 inches (51 mm) above the insulation materials and shall be secured in place to prevent displacement. Venting a High-Efficiency Furnace Through the Wall. (1) Separate air intake and exhaust outlet openings, when located on the same wall or roof, shall be installed so as to avoid contamination of the ventilation air by the exhaust air. An offset using two 45º (degree) elbows will be required for plenum clearance when the vent is increased to 3" (7.6 cm). Mechanical sealed combustion equipment intake should also be located away from likely sources of dust and debris. I've been looking into getting a new gas furnace, but I've gotten conflicting information on what the building code in Chicago requires re the exhaust. venttermination clearance from any air openinginto the building.