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Old 04-08-2011, 11:28 AM   #1
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Fresh Air Intake for High Efficiency Furnaces

I am a homeowner in New Jersey who recently had a Carrier Infinity ICS Modulating Gas Furnace (model # 58mvc) installed. In these types of furnaces the exhaust is vented outside via a PVC pipe. What about the Fresh Air Intake? My contractor has not vented it outside but left it inside. The furnace is located in my work shop area. Is this allowable or isn't it against best practices (or even code)? Case in point, by leaving it in the shop and there is a gas leak, or saw dust and other impurities get sucked in, could there be problems?


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Old 04-08-2011, 12:25 PM   #2
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Some models can use inside air but I run them all outside. I don't like using indoor air as it will cause problems. Look in your installation manual to see the rules for venting that furnace.


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Old 04-08-2011, 12:36 PM   #3
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Hello and welcom HVAC122 to the best darn DIY'r site on the web.

I did briefly look through the attached manual and did not find a specific requirement for combustion air coming from the outside, but, it is always a good idea to do so, from the aspect of maintaining a balanced condition in the house.

When its all said and done there is usually more said than done
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Old 04-08-2011, 03:29 PM   #4
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It is a BAD idea to take air from any workshop especially if there is sawdust or any kind of fumes. Sawdust will get in the burners and cause bad combustion which could foul up and damage your heat exchanger. Apparently you cannot single pipe/take combustion air from your workshop according to p27 in the manual above (ventilated combustion air option in the manual). It must be taken from a WELL ventilated area with a good supply of air free from your living spaces. Ie it can take its air from a crawlspace or attic but not a living area or workshop. Won't meet code where I am and the inspectors go thru the install manual with a fine tooth comb and would shut you down.
"Cut it twice and it is still too short".

Last edited by yuri; 04-08-2011 at 03:41 PM.
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