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One end of the suction pipe of the local exhaust system is on the suction port, the other end is connected with the dry pipe at the three pass of the confluence. The common point of the air flow and the dry pipe air flow at the three pass is called the confluence point of the two strand air flow (such as Figure 1). The two strands of air flow converge at the confluence point, and the general dynamic pressure is unequal, but the static pressure is equal. The static pressure at the junction point is called the residual hydrostatic pressure, which is the actual static pressure at the junction point. The static pressure difference between suction port and converging point is the power of branch suction. For the branch pipe with shape and size, the suction volume of the branch pipe must be fixed as long as the suction state and the static pressure at the junction point of the three way converge. After determining the state of the suction pipe and the shape and size of the branch pipe, the static pressure of the branch pipe at the three pass of the confluence can be obtained according to the wind volume or wind speed, which is called the calculation static pressure of the branch pipe. The shape and size of each branch and the state of suction are the same. If the volume of suction is equal, the calculated static pressure of each branch is equal. If the residual static pressure at the junction point is equal, the suction capacity of each branch is equal. This is the so-called static pressure constant principle. If the remaining static pressure of the dry pipe flow to the confluence point is not only equal, it is equal to the static pressure of each branch pipe, then the suction volume of each branch is not only equal, but also can absorb the wind according to the given air volume. This is the principle of uniform suction.

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