- OP 🔹
- #21
Is the pressure measured upstream of the filter, then downstream to get the delta?No. The ΔP (pressure delta/ drop) is a result of flow. As airflow increases, ΔP increases across the same restriction.
You can get 500 cfm through a clean or filthy filter. The ΔP will be higher with the dirty one, but it's still 500 cam.
