FFU can be used with modular linkage and is widely used in the cleanroom with a turbulent layer or laminar flow. It can be continuously run. And the airflow can reach to 0.45mm/s±20%. Long-life service, low noise, maintenance-free, small vibration, and adjustable speed. It can control thousands of units together. Before packing, it must pass the test according to the ISO14644-1 standard.