I've got a question, so I have this air handling unit that contains 2 filters (Galvanized frame G4 and Bag filter F7) attached together.

At what pressure differential should I set up the manometer, for the alarm of the filter contamination?
F7 Pressure Max pressure advised is 200 Pa
And the G4 is 140 Pa

Do I add the two values together? 340 Pa?

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