Guidelines for attic ventilation
fixtures, exhaust fan openings and plumbing vent stacks, are common areas of conditioned air loss into attics. Additional information about attic venti - lation is provided in the Condensation and Air Leakage Control Section of The NRCA Roofing Manual: Architectural Metal Flashing, Condensation and Air Leakage Control, and Reroofing—2014. 123
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