Noctua NF-A14 industrial PPC-2000 PWM 140mm radiator fans deliver high airflow with minimal noise Performance three-phase motor offers excellent cooling capability and quieter operation Illuminated meter indicates the live system load, temperatures and fan speeds 450mm of reinforced sleeved tubing offers durability, flexibility and chassis compatibility Thicker radiator with larger coolant storage to deliver enhanced cooling performance Minimalist design perfectly complements the aesthetics of the Pro Art-family components.