A powerful 40mm cooling fan for the 4028, 12V 1A, model DBTB0428B2G, high-speed server fan, dimensions 40*40*28mm, dual ball bearing, 4-wire 4-pin.

Model: DBTB0428B2G Dimensions: 40 x 40 x 28 mm Bearing: Dual ball bearing Interface: 4-wire Voltage: 12V Current: 1A Power: 12W Operating Voltage: 7.0-13.4V Maximum Speed: 18000RPM (10% radiator noise) Fan Lifespan: 70000 hours Airflow: 19.4 CFM Additional Features: PWM