This is a VIL100-020 20x25 Sticky Intake Filter. Premium Intake Filters 20/25 20 cs. Designed for air make-up of paint spray booths. The multiple synthetic layers combine a prefilter consisting of a high performance cover mat with a final filter of progressively structured media, thermally bonded & treated with a special adhesive tackifier. Self-supporting panels are designed for 95% efficiency.