"Inflatable Air Blower", the most important indicator intuitive. Units of CFM. Quality is a core fan the greater the amount of wind, the smaller it sounds excellent, of course, some companies will do a lot of speed, but may not be able to do a great amount of wind, my company at the same speed, you can achieve a higher air flow. As long as the fan is running, will have its own wind. We are talking about the wind noise is its own voice. The real "Inflatable Air Blower" noise is relatively sharp or Kaka. Units of db. The human ear generally to 23db above the voice of the human sensitivity, there will be 1-3 db error. This is one of the core part of the "Inflatable Air Blower" of. Leaf fan frame, IC, bearing a three-part core fan. Bearing a direct impact on its life. Will be introduced later in the difference between the bearings.