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07-22-2012, 07:18 AM #1Regular Guest
- Join Date
- Apr 2012
- Princeton NJ
How important outside combustion air?
I've been so happy with the 2 stage/variable speed trane furnace for the main living area, i'm considering replacing the 17 y.o. single stage furnace xe90 upstairs (when I replace the failing air conditioner up there).
The furnace is shoved in a closet, and sucks air from a ceiling louvered grill that connects directly to the attic. Dust particle collect along the cracks of the closet door, so i'm pretty sure a good bit of conditioned air is used for combustion.
How important would adding a roof connecting PVC pipe to this set-up for intake air? Can I ask the pros and cons (my big con would be drilling the hole in the roof and getting it properly sealed)?
07-22-2012, 11:08 AM #2
Does your house have a gable roof? If so the intake could be located in the gable end vs. through the roof."In this house we obey the laws of thermodynamics!"
- Homer Simpson
07-22-2012, 12:11 PM #3
We always install our high efficiency boilers and furnaces with outside combustion air/sealed combustion piping. A hole in the roof with proper sealing is not rocket science. You can easily hire a roofing company to put the flange in place if so desired. And to answer your question directly, combustion air is as important to your furnace as air is to you. Both need to breathe to survive.If YOU want change, YOU have to first change.
If you are waiting for the 'other guy' to change first, just remember, you're the 'other guy's' other guy. To continue to expect real change when you keep acting the same way as always, is folly. Won't happen. Real change will only happen when a majority of the people change the way they vote!
07-23-2012, 08:08 PM #4Professional Member*
- Join Date
- Jun 2010
- Philadelphia PA
You asked:How important outside combustion air?
Using a giant opening to the attic certainly allowed enough combustion air to enter.....Probably way too much! to the detriment of your heating ( and cooling cost) You new unit should address this wasteful detail and still be safe. Probably a 90 percenter would answer your needs along with a good job of sealing/ insulating from a good weatherization/ insulating contractorYou have got to learn from other people's mistakes! Because God knows you don't live long enough to make them all yourself !!!!!!!!
07-23-2012, 09:34 PM #5You can call me Sam
It should be a crime to be a mechanical engineer in San Diego
Summer Design Temperature: 83 F Dry Bulb ~ 69 F Wet Bulb (California Climate Zone 7)