Does my HEPA filter need replacing?

This is a common question, as it’s not always clear when a HEPA filter replacement is necessary.

The first step is to determine whether the filter actually needs changing. There are several signs and indicators to help you decide. Many systems are equipped with sensors that monitor airflow and pressure drop. If your setup includes these, then once they reach pre-set limits (usually detailed in your documentation) it means the HEPA filter should be replaced.

However, in many environments without sensors, you’ll need to rely on physical and visual signs. One major clue is if the fan struggles to maintain airflow, producing a different noise or rhythm than normal. A drop in airflow often signals that the filter is becoming clogged. This can be confirmed by using an installed or handheld airflow meter to compare the current air speed against the expected performance levels of the HEPA filter.

Another simple check is a visual inspection of the filter. If the intake side appears discoloured or dirty, this could mean the HEPA filter is blocked and ready for replacement. Always refer to the technical datasheet and test certificate supplied with the filter for specific replacement guidelines and performance ratings.

For any other questions, or professional specialised advice - contact our team