What must be provided for ventilation openings in attics larger than 1/4 inch?

Ventilation openings in attics larger than 1/4 inch must be equipped with corrosion-resistant wire cloth screening to prevent the entry of pests while allowing for appropriate air flow. This type of screening is important because it effectively keeps out small animals and insects, which can cause damage or contribute to blockages. The use of corrosion-resistant materials is essential for durability and longevity, as these screens are exposed to varying weather conditions that can lead to rust and degradation over time.

Using standard rain prevention fabric would not provide the needed level of airflow while protecting against pests. Plastic mesh, while it may offer some degree of coverage, often doesn’t match the structural integrity and durability of corrosion-resistant wire cloth. Open screening without requirements would not be sufficient, as it could lead to unauthorized entries by wildlife, ultimately compromising the attic environment. Therefore, the requirement for corrosion-resistant wire cloth screening is crucial to maintaining the integrity and functionality of attic ventilation systems.