Find the Right Filter for Your Purifier

Current models

The AirMend pre-filter does not fit alongside the TrueCarbon filter. If you run a TrueCarbon unit, order the carbon filter on its own.

Retired models we still support

We promise filters for the life of the product. If your purifier still runs, we still stock the filter.

The EJ120 has room for the HEPA filter and one of the two carbon options. Granular activated carbon handles a wider spectrum of gases. The pleated carbon filter restricts airflow less. Pick based on whether odor removal or airflow matters more in your space.

When to Replace Your Filter

Most Oransi filters run 12 months in normal household use. That number moves with how hard the purifier works.

Replace sooner if you have pets, if anyone smokes indoors, if you run the purifier through wildfire season, if the unit sits in a workshop or a room under renovation, or if you run it on high speed most of the time. Replace on schedule or slightly later if the purifier runs a few hours a day in a clean, closed bedroom.

How to tell, by filter type

• HEPA filters load up visibly. Pull the filter and look at the intake side. Grey, matted, and packed means it is done. You may also notice the purifier running louder at the same speed setting, or moving noticeably less air.
• Carbon filters give you no visual warning at all. Carbon saturates rather than clogging, so a spent filter looks identical to a new one. The reliable signal is that an odor you had under control comes back.
• Pre-filters collect hair, lint, and large dust. Check monthly. Most are cleanable rather than disposable.
• UV lamps in the Finn have a rated life of 8 to 12 months. Output falls off before the lamp visibly fails, so replace on schedule rather than waiting for it to go dark.

Can You Clean a HEPA Filter Instead of Replacing It?

No. A HEPA filter is a dense mat of fine fibers arranged in a precise structure. Washing it collapses that structure and leaves gaps that particles pass straight through. Vacuuming a HEPA filter pulls fibers loose and does the same thing. Once the media is damaged the filter still fits, still lets air through, and no longer filters properly, which is worse than a clogged filter because there is nothing to warn you.

Pre-filters are different. Most Oransi pre-filters are designed to be cleaned. The Max pre-filter should be vacuumed lightly and never washed. The mesh pre-filter on the Mod series can be vacuumed or wiped with a cloth. The v-HEPA filter includes a washable pre-filter.

If a product listing does not say a filter is cleanable, treat it as disposable.

Why Genuine Filters

Third-party filters for our purifiers exist and they are usually cheaper. Three things worth knowing before you buy one.

Fit determines performance. Air takes the easiest path available. A filter that is close but not exact leaves a gap at the edge, and unfiltered air goes around the media instead of through it. The purifier sounds normal and cleans far less than its rating.

Media grade is invisible from outside. Two filters can look identical and use different media. Our AHAM Verified CADR ratings are measured with our filters installed. Change the filter and the rating no longer describes what the machine does.

Carbon quantity is where corners get cut first. Carbon is the expensive part. A copy of a carbon filter that carries a fraction of the carbon looks the same in the box and stops controlling odor months earlier.

Every filter on this page is made to the specification the purifier was engineered and tested against.

Subscribe and Save

Most of our filters can be set to ship automatically every 6, 9, or 12 months, at 10% off. Filters are easy to forget, and a forgotten filter is the most common reason a purifier stops performing. You can pause, skip, delay, or cancel at any time.

Free shipping in the US on all filters, excluding Alaska and Hawaii. Orders placed by 12pm Eastern, Monday to Friday, usually ship the same day.