99.91% Purification Rate: The 150W DC motor of the fume extractor creates a powerful 165 CFM airflow to exhaust and purify the air. After using, the smoke purification rate is as high as 99.91%, allowing you to breathe fresh air again. 3-Stage Filters: The solder fume extractor has 3 stage filters for high-quality filtration. A cotton filter, central HEPA filter, and an activated carbon filter absorb all smoke, dust, and harmful gases at work. The filter boasts of pleated design, with an expansion area of 2.1m2, significantly increasing filtration effectiveness. 3 Adjustable Speeds: The speed of our welding fume extractor can be adjusted according to your work needs. Three stages speed from strong to weak can meet different working requirements. Only when you has a comfortable working environment, you can improve work efficiency. Low Noise Motor: The powerful 150W DC brushless motor of the FL-250 fume extractor creates a max rotation speed of 4500 RPM