The earliest use of the equipment in the forced draft fan and blowpipe for sensible heat fresh air ventilator, the ancient Egyptian pottery goldsmith once used blowpipe with air nozzles, Incas sometimes 8-12 brass while blowing. Later, invented in order to hide the production of blast bladder full hot new wind ventilators, cystic duct and the ends of divided by the operator control piston inlet. Such simple blower still be adopted in modern times some areas. Eighteenth Dynasty of Egypt Mill Luck (Rekhmir, about the 15th century BC) tomb mural paintings have pot-shaped foot blower image. When the inlet, the operator with a rope hauled bladder, then depress the wind drum into the furnace, each furnace blower is equipped with four, two opposite operation. 1. The choice of the control parameters for wind chassis air flow, total pressure, efficiency, noise, and electrical power. There are centrifugal and axial flow. 2. The fan since the wind chassis, muffler favor. 3. When the fan selection should consider piping system leakage losses calculation error fresh air ventilator, and the actual amount of wind fan, negative pressure deviation, the general air volume of 1.05 to 1.1, pressure of 1.10 to 1.15 safety factor. But not using too large, long-term in order to prevent the fan zone inefficient operation. 4. Note the pipe resistance characteristics matching networks and fan characteristics. For the stable operation of the fan fresh air ventilator efficiency, should make the fan work near its maximum efficiency point, the operating point of the fan performance curve to the right of the peak point of the total pressure (ie, the amount of side winds, and generally all- 80% of the peak pressure). The new wind ventilators total heat fresh air ventilators _ _ Rich ventilation equipment provided by Dezhou Plumper ventilation plant. Dezhou Plumper ventilation plant (0) strong, credible, in Dezhou fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Plumper ventilation equipment into the brilliant and you work for a better future!