You are currently viewing When to Replace HEPA Filter

When to Replace HEPA Filter

When should you replace your HEPA filter🤔?

It is a bit hard to determine when it is the right time to change an old HEPA filter.

There are many factors involved including: usage time, air pollution, filter positioning and even humidity.

The recommended time to replace the HEPA filter is between 3 to 6 months which is a very broad average.

In reality, a filter should be changed when its ability to filter a high degree of particles is reduced. If you continue to use a filter that is only 50% efficient, that means it will take around double the amount of time to purify the air in the same room compared to a filter with 99% efficiency.

At AirDeveloppa, we have come up with a little experiment that you can do to know if it’s time to get a new HEPA filter.

You will need:

✅ A PM2.5 meter (such as the AirCheck Mini).
✅ A room with a PM2.5 concentration of at least 100ug/m3.

1. Measure the PM2.5 concentration in the room 👉 165ug/m3 (in this example)

2. Multiply the concentration times 0.05(5%) 👉 165*0.05 = 8.25

3. Place the PM2.5 meter at the air output of your air purifier.

4. The meter should read below the calculated value. A good HEPA filter should filter up to 99.5% of PM2.5.

After months of using the filter, this value will drop. If the efficiency of your filter is below 95% to 90%, then, it is time to replace your HEPA filter.

Buy a new HEPA filter

This Post Has 2 Comments

  1. Annette

    Interested to buy 16 AirCleaners, can you let me know the price please. Interested in Blue, any other colours, other than purple. Thank you.

    1. airdeveloppa

      Hello Anette,

      Sure! We have them in stock. Kindly send us an email at or contact us via Facebook or Line @airdeveloppa.

      Thank you.

Leave a Reply