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Old 03-27-2020, 09:00 PM   #1
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Furnace high efficiency vent size


Hi,

I had my hvac replaced recently and I was wondering if a 2" pvc is enough ?

the furnace exhaust diameter is 2", my vent run horizontally for 13ft.

Also the vent is really close to the ground outside like 4inches (90 elbow is facing the ground).
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Old 03-27-2020, 09:29 PM   #2
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Re: Furnace high efficiency vent size


Exhaust needs to be above the snow line.
2” is ok to certain lengths. It should state this length in the install manual.
It is PVC correct?
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Old 03-27-2020, 10:33 PM   #3
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Re: Furnace high efficiency vent size


Quote:
Originally Posted by roughneck View Post
Exhaust needs to be above the snow line.
2 is ok to certain lengths. It should state this length in the install manual.
It is PVC correct?
Yes pvc, I dont have the manual. Then I will probably relocate the vent higher
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Old 03-27-2020, 10:34 PM   #4
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Re: Furnace high efficiency vent size


What is the make and model number of the furnace?
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Old 03-28-2020, 05:54 PM   #5
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Re: Furnace high efficiency vent size


Check the manufacturer's specifications and follow them. With a high efficiency furnace what you have is not so much an exhaust line as a condensate line and so the pipe cannot be level to function properly.
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Old 03-28-2020, 07:05 PM   #6
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Re: Furnace high efficiency vent size


The PVC vent pipe size depends on the size of the furnace and the length of the run. This will be detailed in your installation instructions.
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