Defro MVHR filters

Model compatibility

This category includes filter sets compatible with all major Defro MVHR ventilation units, including:

• DRX V / OPTI series

To ensure the right fit, it’s important to know the exact model of your ventilation unit, as different models require different filters. You’ll find helpful tips on identifying your device in the FAQ section.

Filter types and what they protect against

Filter Loop’s replacement filter sets for Defro units are designed to ensure optimal air quality and system performance through dual M5 filtration and an optional activated carbon filter:

• M5 filters (ISO ePM10 55%) on the extract and supply side: ideal for capturing larger particles like pollen, mould spores, pet dander, and house dust.
• M5(AC) filter (ISO ePM10 55%) on the supply side: with a layer of activated carbon, which adsorbs a wide range of gaseous pollutants and odours.

Usage and maintenance

To keep your MVHR system running efficiently and your indoor air clean, we recommend replacing the filters every 3–6 months. However, this depends on your environment, if you have pets, or nearby construction.

To make the process easy, we provide step-by-step replacement instructions for each filter model. You can find them under the “How to change” tab on every product page.

Manufacturing quality you can trust

The original Defro filters are manufactured in Poland using advanced filtration technologies. Our carefully developed house brand filters are also made in the European Union by certified manufacturers. Both are produced with high-quality materials, under strict ISO 16890 standards to ensure high filtration performance and reliability.