- Plug the static pressure probe into the "low" port of the differential pressure gauge.
- Plug the total pressure probe into the "high" port of the differential pressure gauge.
- Hold the static pressure probe at a right angle to the flow of air from the filter.
- Hold the total pressure probe parallel to the flow of air from the filter.
- Read the pressure drop from the gauge.
How to Calculate a Pressure Drop Across Air Filters
Air filtration systems consume energy. The amount of energy they consume depends on how much resistance the filter offers to air, with filters that offer a lower resistance consuming less energy. Energy-efficient filters create a lower pressure drop across them. A filter that offers a higher active surface area produces a lower pressure drop. Thicker, deeper filters also create lower pressure drops. The easiest way to monitor a filter's pressure drop is to measure it directly using a differential pressure gauge.