![]() Compute the total pressure loss per unit length of the new branch as its root pressure divided by its length.This will be the new critical path and the node pressure acts as root pressure. Exclude sections that belong to the critical path and recalculate to select the longest branch from the remaining sections.To achieve pressure balancing, node pressures must be dissipated in corresponding branch sections. Assign a total pressure at each node of the critical path.If the selected fan does not satisfy the pressure requirement, change the assigned pressure loss per unit length and recalculate by assigning revised pressure losses in sections. This pressure is called the root pressure, ideally same as the fan pressure. Sum the pressure losses in the critical path and select a fan so that fan total pressure is close to the sum of total pressure losses in the critical path.Note: During such a calculation process, the pressure loss in the critical path, which is already calculated, will change because of the change of cross sections in the branches of junctions. ![]()
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