What is a common defect regarding attic ventilation in relation to whole house fans?

A common defect regarding attic ventilation in relation to whole house fans is indeed that attic ventilation openings are inadequate in area or blocked. Proper attic ventilation is crucial for maintaining a healthy home environment and ensuring the longevity of the roofing materials. If the ventilation openings are too small or obstructed, air flow can be severely restricted.

When whole house fans are utilized, they pull large volumes of air into the home from outside through windows, creating a negative pressure that draws air up from the living space and vents it into the attic. If the attic ventilation is insufficient, this can lead to a buildup of stale air and moisture in the attic, which can contribute to problems such as mold growth, decreased energy efficiency, and deterioration of structural components.

Thus, ensuring that attic ventilation openings are appropriately sized and free of obstructions is vital for allowing adequate airflow, which aids in removing heat and moisture from the attic space effectively.