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Critical path

Critical path

Critical path

(OP)
I am a little bit confused on this: After pressure balance by design, how could there be a critical path (since all paths have the same pressure loss now)? I am designing a local exhaust system and each path starts from the terminal to the exhaust fan.

RE: Critical path

Critical path is the one with balancing damper all open if they did it right.

All paths will have equal pressuredrop - no matter what. Problem is, this is not the flow you want. So you use dampers to reduce the flow while keeping pressure the same in all runs.

RE: Critical path

Critical path is usually but not always the longest run.

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