The innovative Barometric Ball Bearing technology provides longer life span while remaining lower noise level. Removable blades for quick and easy cleanup. Outstanding 16-blade design covers maximum area to generate striking airflow, even under low speed operation. High airflow design gives excellent chassis ventilation. One-of-a-kind turbine shape inspired by a powerful turbine engine. 1800rpm fix-speed high air flow, 100K hours life, 1.96 mmH20 Barometric Ball Bearing