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calculations

  1. T

    Attic Ventilation exception

    Hi there, I wanted to see if I can get your take on the 1/300 nfva exception for attics. When it comes to calculating vents for small attic spaces I am getting hung up specifying a vent that fits within the upper vents 40-50% limit. For example: Attic over a porch is 123 s.f. At 1/300 the...
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