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-   -   High Efficiency Furnace Combustion and Exhaust (http://www.diychatroom.com/f17/high-efficiency-furnace-combustion-exhaust-50778/)

pirateo 08-12-2009 04:05 PM

High Efficiency Furnace Combustion and Exhaust
 
My new 95+ efficiency furnace had new pvc flues for combustion and exhaust added that now go out on the side of the house. The outlet is the same height as my fresh air intake and about 3 feet to the left.

Is there any risk having the fresh air intake and this outlet from the furnace so close?

yuri 08-12-2009 06:08 PM

3 feet is fine with the code. You need to keep the snow away so the fumes don't swirl back to the intake and watch it on a cold day for recirculation.

pirateo 08-12-2009 07:03 PM

Quote:

Originally Posted by yuri (Post 313556)
3 feet is fine with the code. You need to keep the snow away so the fumes don't swirl back to the intake and watch it on a cold day for recirculation.

Thanks!

dac122 08-13-2009 08:16 AM

Not to worry, I've seen them closer and still within the manufacturers install guidelines. Just follow yuri's advice if you live where you get cold and snow as it is not unusal for the intake or exhaust to ice up causing a blockage. Blockages cause a safety lock-out condition where the unit will not fire. If the PVC pipes don't have some large screening on them I would add it as kids and insects are the sworn enemies of those pipes promising to plug them.

hvac122 08-13-2009 09:55 AM

If your in a cold area don't put screen on them as this will freeze up and cause lockouts.

pirateo 08-13-2009 11:03 AM

I was actually wondering about putting a screen over it. I've found a few bugs my blower compartment that came from the pvc.

Would it be okay to have the screen over it in the warm months and then take it off in the winter?

hvac122 08-13-2009 11:48 AM

It would be fine when the unit is not in use.

pirateo 08-13-2009 11:58 AM

Quote:

Originally Posted by hvac122 (Post 313861)
It would be fine when the unit is not in use.

Thanks!


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