16 x 20 x 1. Actual Size: 15 13/16 x 19 11/16 x 13/16. MERV 2 rating. Classified UL. Filter life: 30 days. What is MERV? The higher MERV (minimum energy reporting value) indicated better performance. MERV was developed by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), an impartial widely-recognized authority on air filtration.