When selecting PC fans for wholesale or industrial use, prioritize Airflow (measured in CFM) and Static Pressure (mmH2O). For case ventilation, high CFM is ideal, while high static pressure fans are essential for radiators and heatsinks. Ensure the Bearing Type aligns with the expected lifespan; Fluid Dynamic Bearings (FDB) or Dual Ball Bearings are preferred for 24/7 operation due to their 50,000+ hour MTBF (Mean Time Between Failures). Additionally, verify the PWM (Pulse Width Modulation) support for precise speed control via 4-pin connectors.