The PRO-SOURCE 20" x 20" air filter features a durable steel frame which ensures long-lasting use and stability. Designed with a high filtration capability, it effectively captures dust and allergens. Its rigid construction prevents any bending or warping under pressure, maintaining integrity throughout use. The mesh design of this filter maximizes airflow while ensuring efficient filtration performance. Compatible with most standard air handling units, this product offers versatile application in various settings.