Does my HEPA filter need replacing?

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

    • Related Articles

    • Which Depth of HEPA Filter Do I Need? A Complete Guide

      Which Depth of HEPA Filter Do I Need? A Complete Guide When it comes to selecting a HEPA (High Efficiency Particulate Air) filter for your air filtration system, one of the most common questions we hear is: “What depth of HEPA filter should I ...

    • HEPA Filters: Wooden Frame vs. Metal Frame – Which One Is Right for You?

      One of the most common questions we receive is: What’s the difference between HEPA filters with wooden frames and those with metal frames? If you’re trying to decide which type of HEPA filter is best suited for your needs, this article will guide you ...

    • How do I install my cardboard spray booth filter?

      It doesn't matter which type of cardboard spray booth filter you are installing into your spray booth as they are all installed in the same way. There are just a couple of easy steps to follow that will ensure a successful installation. The first ...

    • When to Replace your HEPA Filter?

      Its very hard to give a definite time for when to replace an old HEPA filter as there are many elements involved, for instance, humidity, filter location, usage time, the quality of air entering the HEPA and the quality of air filtration required. In ...

    • Why should I not clean a HEPA filter?

      Some of you may be thinking of trying to clean your HEPA filter yourself in order to save a little money. But cleaning a HEPA filter is not the best of ideas for many reasons. Firstly, a HEPA contains many extremely thin mesh fibres which enable the ...