The HM 400 White showcases: -Baked-on powder coat. It is rated as 99.97% proficient at eradicating particles as little as 0.3 micron. This simply means that every little speck can be disposed of rather easily. The built-in Centrifugal fan comes with adjustable 3-Speed control, which is pretty much up to 95 percent effective in removing particles 0.1 micron and smaller. What makes this product stand out is its Fan Rating, which simply goes as far as 400 cfm (cubic feet per minute). It also has a permanent Split Capacitor motor which comes highly rated, making it significant for continual usage, even at high RPM. One can simply expect it to have a prolonged lifespan, thus attesting to its durability. It's got a 360 air intake intake system, and is constructed out of pure, stainless steel, hence making it a sturdy machine.