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Old 12-09-2010, 02:20 PM   #1
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Proper venting and intake for a high efficency gas furnace


What is proper way to exhaust and intake sir to be installed on a high efficency gas furnace. My daughters was installed with exhast pipe up thru the old vent in a seperate tube to the Ruth. The intake is just set to take air outside the furnace, I thought intake was to come from outside. It's a Lennox Furnace

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Old 12-09-2010, 04:47 PM   #2
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Proper venting and intake for a high efficency gas furnace


It is legal and can be done either way.

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Old 12-09-2010, 05:10 PM   #3
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Proper venting and intake for a high efficency gas furnace


Per mfgr's instructions.
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Old 12-09-2010, 05:56 PM   #4
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Proper venting and intake for a high efficency gas furnace


Lennox allows some furnaces to use inside air for combustion and others must have both vents to the outside. The insructions will say which is correct for her furnace.
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Old 12-09-2010, 06:16 PM   #5
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Proper venting and intake for a high efficency gas furnace


Post the model # and we can look up that info for you.
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Old 12-09-2010, 06:39 PM   #6
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Proper venting and intake for a high efficency gas furnace


Quote:
Originally Posted by Hwyant
What is proper way to exhaust and intake sir to be installed on a high efficency gas furnace. My daughters was installed with exhast pipe up thru the old vent in a seperate tube to the Ruth. The intake is just set to take air outside the furnace, I thought intake was to come from outside. It's a Lennox Furnace
When in staling a single ex. System combustion air can be taken from a confined space if the proper cu. Feet is in the area 50 cu feet per 1000 btu's. However it is always recommended to use a two pipe system when possible.

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