Proper venting and intake for a high efficency gas furnace

12-09-2010, 03:20 PM	#1
Hwyant Newbie   Join Date: Dec 2010 Posts: 1	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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12-09-2010, 05:47 PM	#2
yuri Hvac Pro   Join Date: Nov 2008 Location: Winnipeg, Canada Posts: 6,626	Proper venting and intake for a high efficency gas furnace It is legal and can be done either way. __________________ "Cut it twice and it is still too short". To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

12-09-2010, 06:10 PM	#3
fitter1 Member   Join Date: Nov 2010 Location: N. Central Ma. Posts: 33	Proper venting and intake for a high efficency gas furnace Per mfgr's instructions.

12-09-2010, 06:56 PM	#4
Marty S. Member   Join Date: Oct 2009 Location: Nebraska Posts: 2,298	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.

12-09-2010, 07:16 PM	#5
yuri Hvac Pro   Join Date: Nov 2008 Location: Winnipeg, Canada Posts: 6,626	Proper venting and intake for a high efficency gas furnace Post the model # and we can look up that info for you. __________________ "Cut it twice and it is still too short". To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

12-09-2010, 07:39 PM	#6
Hixheat1 Member   Join Date: Dec 2010 Posts: 117	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.