How to include unknown booster fans in an industrial extraction duct network?

[anisbedad99]

Hi,

I’m working on an industrial fume extraction system, with a main duct line and several secondary branches connected through booster fans.

I’ve already calculated the pressure losses for the main extraction duct, and the main fan is known (with its performance curve).
However, I have no technical data for the booster fans — no flow rate, no pressure curve, only an estimate of their motor power (e.g., 110 kW).

I’d appreciate help on these questions:

• How can I model the boosters’ effect without full specifications?
• Can I estimate their pressure rise or flow rate from motor power alone?
• How do I determine whether they assist or oppose extraction flow at the junction?
• Any simplified method, assumption, or reference to handle this?

Unfortunately, I can’t share the system schematic for confidentiality reasons.

Thanks in advance for any suggestions.