1. The performance parameters listed in the table are calculated according to the data of the highest efficiency point in the performance curve as follows:
total pressure: H= ·ρ·U22 (millimeter of water)
flow rate：Q= · ·U2·3600 (m3/h)
shaft power: N= (kw)
ρ—air density 0.1224 kg·s2/m4
U—Impeller speed = (m/s)
D—impeller diameter (m)
n—Impeller speed (rmp/m)
2. If the actual revolutions of impeller are inconsistent with those listed in the table, the fan flow rate, total pressure and shaft power will also change accordingly, and the relationship is as follows:
3. The total pressure value in the table is marked with *, if the external diameter of the motor used is so large that the fan performance is significantly different from the characteristic curve of =0.3. If this kind of matching device is selected, the total pressure value in the table shall be reduced by 10% while maintaining the original flow rate unchanged