How Often Should MVHR Filters Be Replaced, and Can They Be Cleaned?

One of the most important maintenance tasks for an MVHR system is filter replacement. Homeowners often ask:

• How often do MVHR filters need replacing?
• Can they be cleaned instead of replaced?
• What happens if MVHR filters are not maintained?

This guide explains everything you need to know about MVHR filter maintenance to ensure optimal air quality and energy efficiency.

‍

The Role of MVHR Filters in Indoor Air Quality

MVHR filters remove dust, pollen, bacteria, and pollutants from incoming air, ensuring a clean and healthy indoor environment. Without regular maintenance, filters become clogged, reducing airflow and system efficiency.

‍

How Often Should MVHR Filters Be Replaced?

The frequency of filter replacement depends on usage, location, and air quality.

‍General Replacement Guidelines

• Urban areas (high pollution): Every 3–6 months
• Suburban/rural homes: Every 6–12 months
• Homes with pets/allergy sufferers: Every 3–6 months

Note: Some high-end MVHR systems feature filter change indicators.

‍

Can MVHR Filters Be Cleaned Instead of Replaced?

Coarse pre-filters can be vacuumed or washed to extend lifespan.
Fine particle (HEPA) filters must be replaced, as washing damages filtration efficiency.

‍

What Happens If Filters Are Not Maintained?

• Reduced airflow, causing poor ventilation.
• Higher energy usage, as the system works harder.
• Poor air quality, allowing dust and allergens to circulate.
• Increased wear on fans, shortening system lifespan.

‍

How to Change MVHR Filters

1. Turn off the MVHR system to avoid dust circulation.
2. Remove the filter covers and check for dust buildup.
3. Vacuum pre-filters if applicable.
4. Replace HEPA or carbon filters with manufacturer-approved replacements.
5. Restart the system and check airflow levels.

‍

Long-Term Cost & Energy Savings

• Regular filter maintenance keeps energy consumption low.
• Replacing filters on time prevents expensive repairs due to blocked airflow.
• Extends the life of your MVHR unit, saving on costly system replacements.

‍

References

• [1] UK Indoor Air Quality Report, 2024
• [2] MVHR Filter Maintenance Guide, 2023

‍

Author Bio

Dr. Julian Carter is a highly experienced thermal systems expert with over 15 years in the field, holding a PhD in thermal systems. His career spans academic research, consulting, and teaching, focusing on air conditioning and refrigeration systems. Dr. Carter bridges the gap between theoretical advancements and practical applications, providing expert insights to organisations like ClimateWorks, where his guidance informs decision-making and industry best practices. Notably, he has worked on international projects with organisations such as Daikin Industries, the International Institute of Refrigeration (IIR), and the United Nations Environment Programme (UNEP). These collaborations addressed energy efficiency, sustainable refrigerants, and advanced cooling technologies. Currently a lecturer at Edinburgh University, Dr. Carter combines his expertise with a passion for educating the next generation of engineers and advancing climate control technologies.

‍