What are the key parameters for fan comparison?

When comparing industrial cooling fans, evaluate these 10 parameters in order of importance: 1. Airflow (CFM or m³/h) — how much air it moves 2. Static Pressure (Pa or inch-H₂O) — ability to push air through resistance 3. Noise Level (dBA) — especially critical for occupied spaces 4. Power Consumption (W) — direct operating cost 5. RPM — rotational speed 6. Bearing Type — determines lifetime and mounting flexibility 7. Voltage & Current — electrical compatibility 8. IP Rating — environmental protection level 9. Operating Temperature Range — min/max ambient 10. Dimensions (frame size + thickness) — physical fit For specific applications, additional parameters matter: MTBF for mission-critical, speed control type for variable cooling, weight for portable/aviation.