Six principles of fume purification equipment of fan selection:
1、山东通风管道加工计算管网阻力，管网阻力包括局部阻力及沿程阻力。 A、局部阻力包括：变径管、弯头、进风口、出风口等阻力 B、沿程阻力：直管的阻力;
1, calculate pipe network resistance, pipe network resistance including local resistance and along resistance. A, local resistance include: variable pipe, elbow, inlet, outlet and other resistance B, along the resistance: straight pipe resistance;
2, according to the pipe network resistance, plus equipment resistance, plus 15% safety factor, that is the total pressure of the fan. Note: Fan volume = equipment handling air volume;
3, according to the fan's total pressure and air volume, considering the specific noise level of fan, under the same parameter condition, the fan with lower noise level can reduce the noise greatly;
4, in the choice of fan, the three-phase four wire system is the best choice, such as the user without three-phase four wire power supply, in the fan and equipment selection, please note;
5, a single volume is more than 8000m3/h, must use the three-phase four wire fan;
6. Fan should have independent power switch.
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