For a gable roof with a total roof area of 2,400 square feet in California, what is the minimum net free ventilation area required if using the 1:300 ventilation ratio with both intake and exhaust vents?
Correct Answer
C) 4 square feet intake, 4 square feet exhaust
CRC Section R806.2 allows a 1:300 ratio when intake and exhaust vents are provided. Total required area: 2,400 ÷ 300 = 8 sq ft. With balanced ventilation, this is split equally: 4 sq ft intake at soffits and 4 sq ft exhaust at ridge, providing optimal airflow for California's temperature extremes.
Why This Is the Correct Answer
CRC Section R806.2 allows a 1:300 ratio when intake and exhaust vents are provided. Total required area: 2,400 ÷ 300 = 8 sq ft. With balanced ventilation, this is split equally: 4 sq ft intake at soffits and 4 sq ft exhaust at ridge, providing optimal airflow for California's temperature extremes.
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