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Can a 100,000 btu kenmore high efficiency furnace be vented with 2.5 inch pipe, and if so how many feet of pipe and 90s are allowed?

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No,read the manual or hire a professional or burn house down or die!!!

Posted on Apr 23, 2015

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Posted on Jan 02, 2017

  • 15 Answers

SOURCE: Venting a Dayton 4E454 24,000 BTU gas furnace

If you intend to use this in a residential garage, you will have to use standard galvanized round pipe coming off the unit, 24 gauge will suffice, use a minimum of 6”-8” from the unit. From there you will have to make the transition to the B-Vent. Always double check with you local codes in your area.

Hope this helps.

Posted on Dec 02, 2008

Therinnaiguy
  • 1420 Answers

SOURCE: Condensation running down old vent pipe running to roof.

This is a condensing furnace and is ment to condense. You will need to pipe away the condensate using a hose and maybe a condensation pump. It is unclear where the combustion air pipe is going? Are you using room air? or do you have a second pipe going up the old vent as well?

Posted on Jan 06, 2009

  • 2 Answers

SOURCE: RHEEM HIGH EFFICIENT FURNACE-BACKDRAFT SHUTTING IT DOWN

Build some kind of barrier outside so the wind doesn't hit the vent. A piece of plywood before it or a big box around the vent. There is a pressure switch that the wind is messing with. It is a safety and necessary for the furnace to run properly.

Posted on Mar 25, 2009

  • 252 Answers

SOURCE: i have a category IV furnace. make up air venting??

You're beating your head against a wall! Just do what the inspector says or he can make life very hard. EVERY house needs fresh air!

Posted on Sep 26, 2009

  • 252 Answers

SOURCE: gmh95/gch9 manual calls for 3 inch exhaust pipe?

furnaces must be vented EXACTLY as specified by the mfr or you WILL have problems - they spend a lot of time and money coming up with those specs. then design the furnace based on them.

Posted on Oct 07, 2009

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Furnace has water under it, why? Its a Dayton gas furnace.


There are several questions that need to be answered about what type of system you have, but i found this posting that may help:
As your gas furnace runs, is there water leaking at the base? Is the furnace's air filter wet, too?There are a few things that could be happening here. But if you have a high-efficiency furnace, here's the most common cause: a condensation leak.
We'll explain why a furnace creates condensation, and what's causing it to leak out of your furnace.
Note: You'll know if you have a high-efficiency furnace if:
  • The yellow energy guide tag says your furnace's efficiency is 90% or higher AFUE.
  • The vent/flue pipe is white PVC as opposed to metal.
Why a high-efficiency furnace creates condensation
How in the heck does a high efficiency furnace create condensation/water anyway?
It's all about how the furnace extracts heat from combustion gases.
A lower-efficiency furnace extracts some heat from combustion gases and then quickly vents them out the flue pipe.
But a high-efficiency furnace, to extract more heat, has 2 heat exchangers. These allow the furnace to extract heat from the gases for a longer period of time. This causes the combustion gases to cool and then condense.
That condensation then exits out your home through a drain. But if that water is pooling around the furnace, there's a problem preventing it from draining properly.
Causes of a condensation leak around a high-efficiency furnace
  • Clogged condensation tubing
  • Clogged condensation drain
  • Breaks in the condensation line
  • Issues with the condensate pump (if you have one)
You'll need a furnace technician to diagnose which of these is the issue and then fix it.
Other causes of leaking water around a furnace
If you have a conventional, standard-efficiency furnace...then its flue pipe may be incorrectly sized.
If you have a whole-house humidifier connected to the furnace...there may be an issue which is causing the humidifier to leak into your furnace. Your humidifier should be getting annual maintenance from a professional to prevent this.

Dec 13, 2016 | Dayton Heating & Cooling

2 Answers

What size fresh air vent do I need in a boiler room with a gas boiler and gas hot water heater with about 220,000 btu combined


I suggest that you run a duct that is 3 inches larger than the furnace duct . and you should run it down close to the floor and aim it in the direction of the furnace. this will trap warm air above the vent and supply an adequate supply of air for combustion. also make sure you have insulated any pipes in the furnace room that carry water or steam you want heat where you live, not going up the chimney.

Aug 02, 2014 | Water Heaters

1 Answer

What size oil furnace is needed for 1200 square feet?


75000 to 85000 btu Or British thermal pound.
Two units of measure are important in sizing an oil furnace. The first is the British Thermal Unit or BTU, which represents the energy needed to raise the temperature of one pound of water by one degree Fahrenheit at normal atmospheric pressure. The input capacity of an oil furnace is often stated using this unit of measure. The second number is the fuel efficiency rating, which is expressed as a percentage. This represents the amount of energy that gets converted to heat, with higher numbers being better. To determine the energy output in BTUs per hour, multiply the input BTU by the efficiency rating. For example, a furnace with 100,000 BTU of input and an efficiency rating of 89 produces 89,000 BTUs of output. One with an efficiency rating of 80 and the same input amount, produces only 80,000 BTUs of output.

Read more: http://www.ehow.com/info_12197488_size-oil-furnace-required-1200-square-foot-house.html#ixzz2jfsuqLFx

Oct 25, 2013 | Heating & Cooling

1 Answer

I had my original "low"


Hello there, Usually the flue size is determined by the BTU which is generated by the unit. Considering that your unit produces between 35,000 and 40,000 BTU per hour the 2" Flue is okay. Although if you can replace it a 3" will do the job better but the 2" will not cause any harm if left in place as the quantity of BTU generated is equivalent to 2" of flue.
Hope this solution has been helpful?
Thank you for visiting FixYa.

Aug 13, 2011 | Heating & Cooling

1 Answer

How many BYU is a Lennox G40UH (x) series furnace? And can it be vented with PVC? Thanks alot!


The Btu rating for this furnace is 40,000. Since the furnace has a 3 /34" metal flue collar on the top of the unit, you can not use PVC pipe to vent it. Only 90+ efficient gas furnaces can use PVC pipe for venting and the also come equipped with a condensation pump, which yours doesn't.

For more information on your furnace and how it's to be safely installed and vented, here is a link to the installation manual http://www.greenwoodheating.com/products/manuals/gasfurnaces/G40UH.pdf that you can download and print.

Hope this helped answer your questions?

Mar 18, 2011 | Heating & Cooling

1 Answer

Can I vent my ultra v tech 80 propane gas furnance with pvc so I can do away with chimney


Generally, the furnace must be at least 90+ efficiency to be able to use PVC pipe. In addition, high efficiency gas furnaces require a condensation pump, to pump excess moisture out of the furnace. If yours has always been venting up a vent pipe, then NO, you can't use PVC pipe.

Hope this helps you.

Mar 14, 2011 | Heating & Cooling

1 Answer

I have a goodman 95% 90,000 btu variable speed furnace. I know it calls for 3inch diameter venting but can I get away with 2inch if the length is 25 feet with four elbows?


Hi,
If you want to go 2 inch through the wall you can do that, but go with three inch from the furnace through the ell's and then reduce it down at the end, then you will be okay,,,,,2 inch all the way will probably give you nusiance trips of the pressure switch...

heatman101

Aug 26, 2010 | Goodman Heating & Cooling

1 Answer

Colman mobile home gas furnace to use in my garage/shop


generally speaking a sealed combustion system is inherently more safe than a system that draws it's combustion air from it's ambient location. however, it cannot be considered 100% safe in a potentially hazardous location. The actual system that would be used in a "code compliant" installation would be a 100% outside air unit.
That being said, you can install this in a garage, the vent that you are referring to (if it is a standard mobile home system) is generally directly above the unit and usually no longer than about five feet. It also requires a listed and labeled termination "cap" If you install 90 degree angles or extend the vent too far you will have issues with condensation in the piping that will cause the pipe/ heat exchanger to fail prematurely.
If the system is a 90+ efficeint unit then the PVC venting is generally allowed to be about 30 feet long, with a 1/4 inch per foot pitch back to the unit for condensation, also the general mfg. instructions allow either 2- 90 degree or 4 45 degree fittings in the line. hope this helps

Nov 06, 2009 | Coleman Propane Forced Air Heater...

1 Answer

Gmh95/gch9 manual calls for 3 inch exhaust pipe?


furnaces must be vented EXACTLY as specified by the mfr or you WILL have problems - they spend a lot of time and money coming up with those specs. then design the furnace based on them.

Oct 07, 2009 | Heating & Cooling

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