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-   -   Need to ventilate attic. Help in figure out how many to install. (https://www.askmehelpdesk.com/showthread.php?t=627136)

  • Jan 12, 2012, 10:21 AM
    nanaleeza
    Need to ventilate attic. Help in figure out how many to install.
    Am ventilating a 1800 square foot attic. How many square inches of exhaust should there be? I've been given several answers, which is the correct answer? 2718,1728,211,864.
  • Jan 12, 2012, 11:29 AM
    ballengerb1
    The exhaust venting is proportional to the inlet soffet vents. Attic Vent Calculation
  • Jan 13, 2012, 08:30 AM
    SpringtimeHomes
    If they aren't already there, locate your soffit vents as close to the fascia and roof deck as possible. Use continuous strip vents as opposed to the smaller, circular port vents.
  • Jan 16, 2012, 05:24 PM
    armyjerrysmom
    Ok, I quoted different answers from above and I still was not given the right answer. So, help me out. Which is the right answer? 2718, 1728,211,864 of square inches of exhaust ventillation needed for an 1800 sq ft attic?
  • Jan 16, 2012, 06:57 PM
    ballengerb1
    Using the formula I gave in post 2 you need 6 s/f of both soffit and vent. In s/ inches that is 864

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