Super-sized airflow The Dynamic X2 GP-18 is a powerful 180 mm fan that packs a mean punch in the air-flow department. Massive blades stout 38 mm thickness and a wide 300-1200 RPM range with PWM control allow the GP-18 to yield remarkably high airflow while remaining exceptionally quiet.   Massive 180 x 38 mm fan that yields remarkably high airflow while remaining very quiet High-grade LLS bearing with 90000-hour MTTF delivers long-lasting dependability PWM support offers a wide 300-1200 RPM speed range for silent operation under lighter loads and maximum airflow during more demanding activity Optimized fan geometry balances airflow with extra emphasis on static pressure for great performance in any usage scenario Aerodynamic stator struts with embedded wiring helps reduce noise and turbulence Stator struts sit on a wide angle to the trailing edge of the blades resulting in a lower noise level and smoother noise profile Strategically placed notches near the fan hub on the trailing edge of the blades help to eliminate the humming noise produced when the blades pass stator struts Trip Wire technology introduces a micro-turbulent layer that helps to combat elements that negatively affect performance providing an overall more efficient and quieter fan environment Customized design contributes to a cool running and beautiful looking build Fits standard 180 mm fan mounts with 165 x 165 mm screw hole pattern