How Often to Change the Air Filter in Air Purifier for Maximum Efficiency

How Often to change Air Filter in Air Purifier

Most air purifiers come with a disposable air filter. This air filter needs to be replaced from time to time, typically every few months. This article will discuss how often you change your air filter and provide maintenance tips.

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How Often to Replace Air Filter in Air Purifier

Most manufacturers suggest changing the air filter every three months. If you have pets or dusty conditions in your living area, you may need to change it more often.

Most modern air purifiers use filter replacement indicator lights. When the filter gets dirty or completes its useful life, the light changes its colour. That’s the time you need to change the filter. So, you should keep an eye on the filter replacement indicator light to change the filter on time.

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What is an air filter?

An air filter is a device in your air purifier that helps remove particles in the air. The more efficient air filters will remove more than 99% of particles in the air.  It means you can breathe cleaner and healthier air.

Different Types of Air Filter

Several different filters are available, depending on what type of filter air purifier you have. HEPA air filter is a popular option; these filters are typically made of micro-fiber and will easily remove particles in the air.

If your air purifier has activated carbon or charcoal as an air filter, it may need to be replaced more frequently than other types of filters.

Why do I need to change my air filter?

More efficient filters can trap particles in the air better. It means that they can remove more contaminants from the air. These filters will become less effective over time if not replaced regularly.

Once they are full of trapped particles, they won’t effectively clean the air. If you use this dirty filter, it will allow dangerous particles to make it back into your breathing space.

Air purifier Maintenance Tips

  • It is recommended that you change the air filter in your air purifier every three months, more often if you have pets or live in dusty conditions.
  • If your air purifier has an activated carbon or charcoal air filter, it will need to be replaced more frequently.
  • Keep track of how long it takes for your air purifier’s filter indicator to turn yellow or red. It is a reminder for you when it is time for a replacement.
  • Make sure to vacuum the exterior and interior of your air purifier at least once a month. It will remove any loose particles that could end up back in the air you breathe.
  • If your air purifier has a HEPA or high-efficiency filter, make sure to keep it clean. It will allow the air purifier to work properly and trap more particles in the long run.

General Filter Replacement Schedule

Types of air purifier Filters

HEPA Filters: Must be replaced every 12 to 18 months

Pre-Filters: Must be cleaned every 30 days and replaced when worn out

Permanent Filters: Must be cleaned every three months and replaced when damaged

Activated carbon or charcoal Filter: Must be changed after 3-6 months

Other considerations when changing the air filter in your home

Pets: If you have pets, you will need to change the filter more often as pets shed a lot of hair. There are also different pet-friendly air purifiers available from manufacturers. These air purifiers are best for capturing all this hair and particles before entering the air you breathe.

Allergies: If you have allergies, you must get an air purifier with a True HEPA filter. True HEPA filter will trap all the allergens in the air. Some filters also have activated carbon which helps to remove pet dander, smoke and other pollutants.

Size of Room: The size of the room will also determine how often you need to change the filter. A small room will require a filter change more often than a large room.

Indoor Air Quality – The more pollutants there are in your home, the shorter a time you can use a filter.


In the end, changing your air filter is an important part of air purifier maintenance. It is crucial to replace the filter according to the manufacturer’s schedule. It will ensure that the air purifier is doing its job and removing pollutants from your indoor air.