Sunon 40x40x20mm Medium Speed Fan EF40201 B2-000U-G99, 3 Pin Dimension: 40 (L) x 40 (W) x 20mm (H) Bearing Style: Ball Air Flow: 7.7 CFM / Noise Level: 22dba Speed: 5400 RPM This model replaces the KD1204PKB2 previously made by sunon, has the same specifications