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Thread: Ventilation

  1. #1
    Join Date
    Nov 2018
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    Ventilation

    I have a ranch house with standard 8 ft ceilings and roof pitch. I have an FV-20NLF1 installed in the attic near the peak of the roof. All the vent pipe is 6" insulated flexible pipe. The intake side splits to two intake grates. There just doesn't seem to be enough air flow through either grate. If I block one of the grates the flow through the other is better but still doesn't seem to be what it should. Is this setup acceptable? What could be causing the reduced air flow?

  2. #2
    Join Date
    Jul 2013
    Location
    Richmond, VA
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    Well for one 6" flex is too small for that ERV. it calls for 6" diameter pipe, but only round pipe (or, what they call "circular pipe" in the manual, flexible metal pipe might be acceptable) is going to carry the designed 240 CFMs, not 6" flex which carries about half at best.

    Two, what's the size of your house and what is the timer set at?

  3. #3
    Join Date
    Nov 2018
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    Thread Starter
    Quote Originally Posted by CircusEnvy View Post
    Well for one 6" flex is too small for that ERV. it calls for 6" diameter pipe, but only round pipe (or, what they call "circular pipe" in the manual, flexible metal pipe might be acceptable) is going to carry the designed 240 CFMs, not 6" flex which carries about half at best.

    Two, what's the size of your house and what is the timer set at?
    Why does flex pipe only carry half?

    The house is a total of 3700 sq ft but the bathroom in question is only about 130 sq ft.

    We run fan during shower then set timer to 60 min after shower

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