If you have looked at our air purifier kits, you will have seen the term MERV-13 attached to every one of them. It is the filtration standard that does the actual work of cleaning your air, yet it is rarely explained in plain terms. This guide covers what MERV-13 means, why we build our replaceable filter kits around it rather than sealed HEPA, and how to keep your kit performing with genuine 3M Filtrete media. Everything here reflects the kits we ship across the UK and EU, tested by Intertek and rated Energy Star Most Efficient 2026.
What MERV-13 actually means
MERV stands for Minimum Efficiency Reporting Value, the standard rating scale used to describe how well a filter captures airborne particles. The scale runs from 1 to 16, and the higher the number, the finer the particles a filter can trap. MERV-13 sits near the top of the practical domestic range.
A MERV-13 filter captures roughly 93% of airborne particles on a single pass. That includes pollen, household dust, pet dander, mould spores, smoke and fine PM2.5 particulate. In other words, it targets the everyday triggers behind hay fever, allergies and poor indoor air, as well as the ultrafine particles produced by cooking, traffic and wildfire smoke.
Why we build these kits around MERV-13, not sealed HEPA
The obvious question is why not simply use HEPA everywhere. HEPA filters capture around 99.97% of particles per pass, which sounds decisively better. In practice the trade-off is more nuanced.
A sealed HEPA filter is dense. Pushing air through it takes far more fan power, which means more noise and more energy for the same volume of air moved. MERV-13 media is less restrictive, so our fans move a much larger volume of air at low resistance. Because clean-air delivery depends on both filter efficiency and airflow, a MERV-13 kit that moves a lot of air often cleans a room faster, and more quietly, than a HEPA unit straining against a dense filter.
The result is a kit that runs at under 35 dB, roughly the level of a quiet library, while still removing the vast majority of what you care about. For the overwhelming majority of homes, MERV-13 at high airflow is the more effective real-world choice. We are happy to be honest about the difference: if you need certified single-pass HEPA performance for a clinical or specialist setting, that is a different product. For clean, breathable air at home, MERV-13 wins on the balance of speed, noise and running cost.
Genuine 3M Filtrete media
Not all MERV-13 media is equal. Our kits use genuine 3M Filtrete filters, which use an electrostatically charged fibre to attract and hold fine particles rather than relying on density alone. That charge is what lets the media capture PM2.5 and smoke while staying open enough to pass a high volume of air.
Using authentic Filtrete media also means consistent, documented performance. Our kits are Intertek-tested and hold the Energy Star Most Efficient 2026 rating, both of which depend on a known, repeatable filter specification. Third-party or unbranded replacements can undermine both airflow and capture, so we recommend sticking with genuine media.
Filter sizes: matching filters to your kit
The filters are standard nominal sizes, so they are easy to source and reorder. Which size you need depends on your kit:
- 5-Fan Luggable uses 16x25 filters.
- 7-Fan XL uses 20x25 filters.
Filters are supplied and replaced in pairs. Because the sizes are standard, there is no proprietary cartridge to hunt for and no risk of being locked into a single supplier. The Fanless Kit is designed for those who already own compatible fans or want the frame and filtration only; you simply add the correct filter pairs for your setup.
When to replace filters, and how the Veya app helps
Filter life depends on how dirty your air is. In a typical UK home, a set of MERV-13 filters lasts around 6 to 12 months. If you are running the kit through heavy wildfire smoke, close to building works, or in a home with several pets, you should expect to replace them sooner, as the media loads with particulate faster.
A loaded filter is a good thing: it means it has been doing its job. But once it is saturated, airflow drops and cleaning slows, so timely replacement matters. The free Veya app tracks your usage and sends a reminder when a change is due, so you are not left guessing or relying on memory. It takes the maintenance decision off your plate entirely.
The running cost is deliberately low. Across a year, filter replacement works out at roughly £2, which keeps genuine, high-performance filtration well within reach as a routine household expense.
How to add filter pairs to a kit
Adding filters is straightforward. When you configure a kit, you can add one or more filter pairs to your order so you have spares on hand for the next change. Because filters are replaced in pairs and use standard sizes, ordering ahead is simple: choose 16x25 pairs for the 5-Fan Luggable or 20x25 pairs for the 7-Fan XL.
Keeping a spare pair in the cupboard means that when the Veya app flags a replacement, you can swap them in immediately with no downtime. We ship both kits and replacement filters across the UK and EU.
Choosing your kit
All three options use the same genuine MERV-13 3M Filtrete filtration; they differ in scale and setup:
- 5-Fan Luggable - £229. Portable and room-sized, using 16x25 filters. A strong all-round choice for bedrooms, living rooms and home offices.
- 7-Fan XL - £279. Higher airflow for larger or open-plan spaces, using 20x25 filters.
- Fanless Kit - £179. The frame and filtration without fans, for those building on an existing setup.
Whichever you choose, you get the same core benefits: around 93% particle capture, under 35 dB operation, roughly £2 a year in filters, Intertek testing, Energy Star Most Efficient 2026 rating, free Veya app reminders and UK and EU shipping.
