Design & Engineering Notes
•Flame-retardant construction: Both frame and impeller adopt UL94V-0 flame retardant plastic to meet strict electronic safety standards.
•Bearing coding: The suffix "B" stands for ball bearing for longer continuous runtime; sleeve bearing and superflo bearing are available upon custom request.
•Wiring standard: Leads follow UL 1061 AWG#24 specification. Pin definition: Red for power positive, Black for sensor, Brown for control, Yellow for assigned feedback signal.
•Custom function coding: The part number system supports waterproof grade selection (non-waterproof / IP55 / IP68) and multiple sensor options: RD alarm sensor, FG tachometer sensor, PWM speed control sensor and temperature sensor.
•Tolerance & environment: Fan speed tolerance is ±10%. Safe non-condensing storage temperature ranges from -30°C to +70°C.
•Mounting layout: Standard four Φ3.5±0.3 mounting holes, with defined rotation and airflow direction for seamless mechanical integration.
Core Strengths
•Ultra-high static pressure: At 30000 RPM, this 4028-B fan pushes strong airflow through narrow ducts and dense component stacks where ordinary low-speed 4028 fans cannot work.
•Smart control ready: Multiple feedback signal choices support intelligent thermal regulation, speed monitoring and fault alarm for automatic control systems.
•Two voltage options: Ready-made 12 V and 24 V versions match most industrial DC power supply schemes.
•Custom waterproof capability: Upgradeable to IP55 or IP68 for dusty, humid and harsh working environments.
•Small but powerful: The 4028 footprint saves precious space inside miniaturized high-power hardware.
•Reliable long-run performance: Ball bearing structure plus tight speed tolerance ensures stable operation for long continuous working hours.
Key Specs
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Applications
This high-pressure 4028-B DC axial cooling fan fits a wide range of high-heat industrial and electronic devices:
•High-density server modules and high-power embedded power supplies
•Laser devices, optical modules and high-speed signal transceivers
•Precision medical instruments requiring compact high-pressure cooling
•Servo drives, frequency inverters and industrial control boxes
•Telecom network switches and base station internal cooling
•Automated test equipment (ATE) and semiconductor peripheral hardware
•Enclosure cooling with narrow air channels
Quick Support Q&A
Q: What does "4028-B" mean?
A: "4028" refers to the fan size: 40 mm × 40 mm × 28 mm. The letter "B" denotes the standard ball bearing version inside the SZR-FB fan family.
Q: Can I get a PWM speed-control version for this 4028-B fan?
A: Yes. We can configure this 4028 DC fan with PWM, FG tachometer, RD alarm or temperature sensor as your project requires.
Q: Is the standard 4028-B fan waterproof?
A: The base standard model is non-waterproof. IP55 and IP68 waterproof variants are available via custom order.
Q: What is the difference between the 12 V and 24 V 4028-B models?
A: They share identical speed, airflow, static pressure and noise. The main difference is rated current: the 12 V model draws 1.9 A, while the 24 V variant only draws 0.95 A.
Q: How loud is this 30000 RPM 4028 cooling fan?
A: The rated noise level is 69 dB-A under standard test conditions.
Manufacturing Support
SZR provides OEM and project-based cooling solutions for compact thermal management applications. Engineering support, rapid sampling and customized specifications are available for long-term cooperation.
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