The Wells 22618 Pre-Filter Hood helps capture grease and airborne particles, supporting cleaner and more efficient kitchen ventilation. Designed as a universal 16" x 20" x 2" pre-filter, it fits compatible commercial hood systems and works by trapping larger contaminants before they reach the primary filter. This process helps maintain proper airflow while reducing buildup inside the ventilation system. Made for consistent performance, it assists in extending the life of main filters and minimizing maintenance needs. Its straightforward installation and reliable filtration make it a practical choice for maintaining a cleaner kitchen environment without adding complexity to routine operations.