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Old 08-21-2012, 12:10 PM   #1
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HVAC duct


a 4 inch duct from the top of my HVAC unit extends up to the roof.
What is it's function ? How long can this duct be to reach the roof?
I live in So Calif.

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Old 08-21-2012, 05:54 PM   #2
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HVAC duct


Could be a fresh air intake pipe.

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Old 08-22-2012, 08:27 PM   #3
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HVAC duct


If you can post a pic it would help us tell you what it is.
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Old 08-22-2012, 08:38 PM   #4
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HVAC duct


Is Type B stamped on it?

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Old 08-22-2012, 08:40 PM   #5
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That would be your exhaust
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Old 08-22-2012, 08:54 PM   #6
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My people call it "flue"
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Old 08-22-2012, 11:27 PM   #7
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HVAC duct


Quote:
Originally Posted by rgolf
How long can this duct be to reach the roof?.
That depends on how high your roof is.

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