Based on this product's specifications, here are some alternatives and similar models
Fan Sharkoon Silent Storm 140 PWM 14 cm 400-1400 RPM Transparent
Summary description:
The Sharkoon Silent Storm 140 PWM fan features a 14 cm diameter, operates at 400 to 1400 RPM, and provides an airflow of 121.9 m³/h. It uses Fluid Dynamic Bearing for quiet operation and has a transparent design.