The article deals with various methods of reducing the interference of local resistances in ventilation networks, as well as the question of the uniformity of air distribution on the branches. A critical assessment of the method of coarsening calculations used in practice is given, which is expressed in the fact that the reference coefficients of local resistances are simply summed up without taking into account the influence of local resistances on each other. It is proposed to use rectifying devices as a method of reducing the interaction of local resistances. The method of determining the length of the honeycomb jet rectifier necessary for the alignment of the velocity field of the flow is given. The use of flow dividers for the uniform distribution of the air flow through the branches is also considered, the system with flow separators is calculated and its pressure losses are compared with a similar system without flow separators.

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