Photo of a Pre-filter

Air purifiers are amazing devices that help to clean the air around you.

From the least efficient to the most powerful, they all seem to have one thing in common – a pre-filter.

But, what does a pre-filter do?

In this article, we’ll take a deeper look into what a pre-filter is on an air purifier and why it’s an important feature to have.

Function of a Pre-Filter

When comparing different air purifying products, you’ll discover that some devices include a dedicated pre-filter while others combine this feature with an Activated Carbon filter.

Regardless of how the pre-filter is outfitted on the device, one thing remains true – the purpose is to act as the first line of defense in order to capture the largest particles possible.

A pre-filter is an essential feature on an air purifier because it prolongs the life of the main filter such as a True HEPA filter.

If the pre-filter was not on the device, then the True HEPA filter would take too much abuse from larger particles and wear out faster. This would result in you having to spend a lot more money each year in filter replacements.

Fortunately, the best products that are featured on our top 10 air purifiers include a pre-filter which makes them a better long-term investment.

Pre-filters are perfect for capturing large debris such as hair fur, dust, and some pollen. Once these particles are trapped, the other filters inside the air purifier can work at maximum levels.

>> See all of Amazon's Best Selling Air Purifiers <<

Most Last a Lifetime, But Some Don’t

As we mentioned above, some pre-filters come as a single piece on an air purifier. Others are combined with an Activated Carbon filter.

Regardless of the type, the good thing is that both of these filters are washable and reusable.

In fact, a dedicated pre-filter on most air purifiers can be washed cleaned and reused for the life of the unit. This means that you’ll never have to pay for a replacement.

On the other hand, if the pre-filter is combined with a carbon filter, then it will need to be replaced once the activated charcoal surface stops working. This will add to your yearly maintenance costs for the unit.

Now you know how significant a role a pre-filter plays on an air purifier. You also know if and when it ever needs to be replaced depending on how the pre-filter is outfitted on the device.

Avatar for David Morrison

About David Morrison

David is an Air Quality & Comfort Technician. He has expert knowledge on the technology and design of air purification, air conditioning, and heating systems. His main role is to write content that helps people get the most value out of their air purifiers, air conditioners, and heating units. (See Full Bio)