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York Gas Furnace Model # P2MPD14N08001A - Combustion Air

Do you know how I could find the combustion air requirements for the subject model? I recently purchased the house and the former owners did not leave behind the owner's manual for the furnace. I am finishing the basement and need to ensure there is sufficient combustion air. Any suggestions?

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The general rule is that gas furnaces need access to all of the air in a basement, so completely sealing off a utility room or closet is almost always a bad idea. Adequate air for combustion can be ensured by either installing vent high and low (both are important) in the finished utility room wall, allowing air from the rest of the basement to be able to flow into the utility room. These should be as large as possible, finished off with a regular return air register on the finished side of the wall. Another way of doing this is to install a louvered door for the utility room/closet, which will also give you enough air access for combustion.

Posted on Nov 07, 2016

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Where are you getting combustion air from now in the midwest 1sq" per 1000 btu York.com with the model number

Posted on Jun 17, 2009

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Posted on Jan 02, 2017

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Trouble shoot Dayton gas furnace model GG9S100C16MP11A fan is left on constant but in cold weather 10 or colder fan will go off and furnace will go thru a restart mode and run fine for awhile then will do...


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Does my furnace require outside air?


I'm surprised the building inspector allowed the condensing furnace you described draw combustion air from the garage !! I'm not familiar with any manufacturer that recommends that as normal practice. Virtuall ALL two pipe condensing furnaces require both pvc pipes to be terminated OUTSIDE the structure with specific heights and distances apart. There is also a limit to the length of both the flu and the combustion air piping and each 90 degree pvc elbow adds the resistance equivalant of roughly 10' of straight pipe. If re-routing is required, you have to bear in mind the direction of 'fall' in the piping usually goes back towards the furnace and remember two 45's may give you a greater variance of change in the piping and still be equal to the equivalant of one 90.

Personally, I would never suggest terminating the fresh air (combustion air) intake between floors of a structure.

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the furnace should have never been installed without combustion air in the first place, is it in the attic, basement, closet? The amount of combustion air depends on the btu's. you can run ,metal ducting to the space. propane is a heavy gas and needs to be installed carefully so gas cannot puddle and fill up a specific application if not installed properly.

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Indicator blicks 3 times replaced combustion air switch but did not resolve problem. what do i do now?


there should be a diagnostic code that will tell you what 3 blinks mean for that model. look on door inside cover. tell me EXACTLY what it does at start up. small draft motor comes on? you see a glow from hot surface ignighter? gas comes on? flame on? it should run in this order.

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Why is my 95% rheem furnace blinking code 2


Check condensate water /drain stopped up. It will allow a start after a reset but then it shuts the combustion air fan down and that shuts the unit down this will require a service tech make sure their familiar
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Furnance just started blowing cold air, checked reset button..checked filter???


Check if they have a "sail switch" that senses combustion air flow before allowing fire. These are a small vane in the combustion air intake that moves a microswitch when air is flowing.

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Drawing combustion air for a gas dryer


I am assuming that this is a gas dryer not an electric dryer.
Per the 2009 Uniform Mechanical Code Section 902.0
(B) Gas utilization appliances shall not be installed so its combustion, ventilation, and dilution air are obtained only from a bedroom or bathroom unless the bedroom or bathroom has the required volume in accordance with Section 701.2. [NFPA 54:10.1.2]
Section 701.2 basically says you need to provide adequate combustion air. One way is if the volume of the space is 50 cubic feet per 1000 btu. I personally think it is a bad idea to obtain combustion air from a bedroom even if it has adequate volume; it used to be prohibited by the Uniform Mechanical Code. The combustion air requirements are based on the BTUs of the appliance not the CFM. For gas pipe sizing purposes the Uniform Plumbing Code says that clothes dryers have a BTU input rating of approx. 35,000 BTUs. One 4" duct to the attic with the opening of the duct inside the closet within 12 inches of the ceiling would provide enough combustion air per the "One Permanent Opening Method" in UMC chapter 7.

Make up air is a different requirement than combustion air. Chapter 5 of the UMC states that if you have a dryer in a closet you need to provide a make-up air opening of 100 sq inches. The make -up air is to replace the air that is being exhausted not to provide air for combustion. The make -up air could be taken form the exterior of the building or another room within the building. Technically the closet should be insulated and weatherstripped if you get the make-up air and combustion air form the exterior.

Sorry doc john but the fire inspector is not talking about the exhaust duct (environmental air duct). That is required no matter where you have installed the dryer and is a totally separate

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