This is a concept model for a 120mm PC fan. Features include:
Golf ball dimpled blades (inspired by the Sharkoon Silent Eagle) Enclosed loop rotor (inspired by the Noiseblocker eLoop) Stepped inlet (inspired by Noctua) Double-curved blades (inspired by the Akasa Viper) Square frame (helps reduce air leakage on radiators) Integrated rubber gaskets Anti-vibration rubber mounting holes