Commissioning a mechanical ventilation system?

Question

When commissioning a mechanical ventilation system how would you take into account the varying pressure drops arising from air flow passing through the clean and dirty filter conditions to ensure the system was always able to deliver the minimum design air flow rates?

Answer 1

First, ask the balance if he accounted for filter dP, and how he did it.

Review the fan curve in the balance report. Typically, you'll be commissioning with clean filters. Once the balance has completed his work, look where the airflow lands on the fan curve.

Make sure that airflow will be adequate with the additional dP from the dirty filter. And that the motor will have enough power.

If you really want to do a test, block some of the filters with strips of cardboard, until the filter dP is at the change point - then check airflow, amperage, etc. But that's usually not necessary.

Answer 2

You don't have to. The maintenance of the system should provide for cleaning or replacement of the filters on a regular basis to maintain the air supply within specs.

It's not not like our residential systems where us owners sometimes forget about our filter systems and let them go until they get totally restricted.

Answer 3

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