What is the minimum opening size for louvers used for intake air openings in exterior walls?

What is the minimum opening size for louvers used for intake air openings in exterior walls?

• A. 1/8 inch
• B. 1/4 inch
• C. 1/2 inch
• D. 3/4 inch

Answer: (B)

Adequate outdoor air supply through exterior louvers requires a minimum opening size. The smallest size that meets this requirement is a quarter of an inch. If the opening were smaller, airflow could be restricted, leading to improper combustion or ventilation. Larger openings would still satisfy the minimum, but the question asks for the smallest acceptable size, which is 1/4 inch. In practice, louvers are often paired with screens to keep pests out, but the dimension that the code specifies for intake openings is the opening size itself.

Adequate outdoor air supply through exterior louvers requires a minimum opening size. The smallest size that meets this requirement is a quarter of an inch. If the opening were smaller, airflow could be restricted, leading to improper combustion or ventilation. Larger openings would still satisfy the minimum, but the question asks for the smallest acceptable size, which is 1/4 inch. In practice, louvers are often paired with screens to keep pests out, but the dimension that the code specifies for intake openings is the opening size itself.