What percentage of free air space do wood air louvers have?

Wood air louvers typically have a free air space of about 25%. This percentage reflects the design of the louvers, which are intended to allow for adequate airflow while providing some level of protection against the elements and preventing pest entry. The air space is a crucial factor in ensuring that the ventilation is effective without compromising the structural integrity or functionality of the louvers. Higher percentages, such as 50% or 75%, would imply a design that emphasizes maximum airflow, which might not be practical or desirable in all situations where wood louvers are used. Conversely, a lower percentage, like 10%, would restrict airflow significantly, undermining the purpose of having louvers for ventilation. Thus, the correct answer, 25%, represents a balanced approach to maintaining airflow while considering the other functional aspects of wood air louvers.