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The resistances of two splits A and Bare 0.35 Ns 2 m -8 and 0.05 Ns 2 m -8 respectively. The combined resistance of the shafts and trunk airways is 0.4 Ns 2 m -8 . A booster fan is planned to be installed in split A to increase the quantity flowing through it. Assuming that the surface fan continues to operate at a constant pressure of 1000 Pa, the critical pressure of the booster fan in Pa is