Under HUD ventilation standards, what is the minimum net free ventilation area per attic floor space?

• A. One square foot per 150 square feet of attic floor space, with a condition changing to 1 per 300 if half the area is in the upper portion.
• B. One square foot per 100 square feet.
• C. One square foot per 200 square feet.
• D. No ventilation required.

Answer: (A)

Attic ventilation is about providing enough net free ventilation area in relation to the size of the attic to keep air moving and prevent heat buildup and moisture. HUD sets a base proportion of ventilation openings to attic floor area, with a specific adjustment if part of the attic lies in the upper portion. The correct option reflects that base ratio and the conditional change for the upper portion, ensuring the attic receives the required amount of ventilation overall. The other choices propose different ratios or claim no ventilation is needed, which would not meet HUD requirements.