Mesh Filter, Mesh Typr Grease FilterAluminum, 16" X 20" X 2"Withstands Commercial Kitchen Wear.No Grease Drippings Onto Grill.Recommended By Insurance Companies.Sanitary - Easy To Clean & Maintain.Efficient Air Flow.Design Traps 98% Of Foreign Matter.Protects Blower System & Motor.Rust Proof-Aluminum.Rugged Construction - Lightweight.Approved By N.Y.C. Bureau Of Stds. & Appeal, Cal No. 10-60 Sm.Meets Requirements Of Nfpa Standards No. 90A & B, ButDoes Not Meet Nfpa96 Standards.