The Trion Air Bear 2000 / Supreme 2000 whole-house filter is labeled “20x25x5” but actually measures 19.75 x 24.25 x 4.94 inches. Unlike 1″ filters, 4″/5″/6″ whole-house filters don't share one universal nominal-to-actual conversion — always match by brand and model, not just the printed size.
From Trion/Johnson Controls' official spec sheet. This is from the manufacturer's own spec sheet.
Match by brand + model, not nominal size. Confirm against your old filter or equipment manual before ordering.
Looking for a 1″ furnace filter instead? Use the full FilterKey tool.