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How It Works
About Epm10 & Molecular Filters
ARM Environments supplies and installs high-efficiency ePM10 and molecular filters for non-residential buildings across the UK. These filters are essential for protecting both occupants and ventilation systems from airborne contaminants that standard filters can't remove.
We begin by assessing your current HVAC setup, air quality requirements, and any known pollution risks — such as roadside location, industrial emissions, or indoor sources of VOCs. Based on this, we recommend the right filtration combination.
ePM10 filters are designed to capture larger particles such as dust, pollen, and fibres, helping protect against respiratory irritation and maintain system hygiene. Molecular filters go a step further, removing gases, odours, and volatile organic compounds (VOCs) using activated carbon or chemically treated media.
We install all filters to manufacturer specifications, ensuring correct sealing to prevent bypass. We also provide lifecycle advice and replacement schedules to maintain consistent performance and compliance with indoor air quality standards.
Service Benefits
- Remove dust, pollen, and fibres
- Eliminate odours and chemical gases
- Support healthier indoor air quality
- Extend system lifespan
Featured Project
Installing ePM10 & Molecular Filters to breathe easy in Central London
Objectives
In Central London, keeping the poor-quality, polluted air out of your building can be tricky. It's no surprise that due to London's densely-crowded centre, levels of gases like Carbon Dioxide and Nitrogen Oxides and particulate matter (PM2.5, PM10) can be particularly high. Our client, nestled tightly between Euston train station, an active construction project, and where the A501 meets Tottenham Court Road, had to meet Building Regulations in order to open their newly-constructed mixed-use block. The problem, however, obviously lies in the heavy pollution in the area due to the combustion from cars and trains and the construction site beside Euston station. To meet Approved Document F of the Building Regulations 2010, this client would either need to prove the outdoor exposure levels are below minimum thresholds, or they would have to install some serious MVHR filters to keep the indoor air clean.
We also had to be mindful that certain filters might obstruct the air path and lower airflow. Our client's Nuaire MVHR units were a major component in how they would keep the building at a stable temperature, and they had been carefully designed to supply around 55 litres per second (l/s) and extract 40l/s from the kitchen extractor and 15l/s from the toilet extractor. If we were to install new, more heavy-duty filters, we would need to be careful not to affect this airflow too much or risk destabilising the entire system.
Solutions
We modelled the outdoor air quality, and the results weren't particularly promising. We anticipated the level of Nitrogen Dioxide pollution (NO2) could be too high to pass Building Regulations at an estimation of just under 40µg/m³. Because this figure was so close to the limit stated within Part F, the council deemed the result invalid to proceed with opening the building for residential use. Instead, we installed diffuser tubes (passive sampling) across the exterior façade of the building, which took a total of 6 months for the data to be considered reliable. Unfortunately, this test also deemed the Nitrogen Dioxide levels to be too high.
Our client, understandably frustrated, asked for our advice. We could test over and over again, but they'd likely fail. Understanding that within Approved Document F it states that technologies may be used 'to minimise the intake of external air pollutants', we advised our client that the next best step would be to install sufficient filters to reduce the levels of pollutants within the indoor space. Effectively, the only option we had would be to take effective measures to cleanse the indoor air as the outdoor air quality was unlikely to improve any time soon.
Accordingly, we then installed ePM10 and Molecular Filters in their Nuaire MVHR units to ensure that they capture any pollutants circulating throughout the indoor space. These ePM10 filters are very effective at removing between 50-90% of all PM10 particles which was crucial in capturing the particles emitted from the local road, construction site, and train station. Molecular filters were also installed to capture the harmful gases like NO2. Testing the airflow (known as ventilation validation) from the MVHR units, we measured a supply of 58l/s (5l/s higher than the design volume), the kitchen extractor measured 40l/s and the toilet extractor measured 15l/s (both identical to their respective design volumes). This results in an overall efficiency increase as the unit runs at 118% of the design volume with these newly-installed filters. With the confidence that residents would be able to breathe safe, clean air, the residential building was finally approved to open.
Results
Ultimately, our client was relieved that they could finally let residents access their building in spite of the heavily-polluted London air. Thankfully, our expert team were able to combat the poor outdoor air quality and Nitrogen Dioxide pollution with effective filtration methods. Our client expressed appreciation that their residents would be happy and healthy breathing the clean indoor air supplied from these new filters.
In this residential block, we recommended filters to be changed every 6-12 months. Given the severity of the outdoor air quality, we offered our client ongoing support, and we continue to supply ePM10 and Molecular Filters for them to this day.
Challenges
- Very poor outdoor air quality
- Central London residential new-build
- Struggling to pass Building Regulations
"This building's proximity to the A501 and Euston station meant that inevitably the outdoor air quality would be particularly poor, and when your outdoor air is polluted, your indoor air can quickly become unsafe too. What we found, worryingly, was that the NO2 levels outside this client's building exceeded Building Regulations and EU limits. This poses a challenge because you can't rely on the tried-and-tested method of flushing out the indoor air by introducing clean outdoor air. We were relieved to overcome this issue with the use of Molecular Filters which work well to capture any harmful gases within the space and didn't significantly impact air flow, either."
Adam Taylor, CEO of ARM Environments
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Why Choose ARM?
ARM Environments is a specialist in air quality for non-residential buildings. We don’t just swap filters – we assess, specify, install and advise on the right filtration for your building’s purpose, location, and air quality goals.
With SafeContractor and BESA certifications, and a leadership role in IAQ standards, we offer a higher standard of service and support than general HVAC contractors. Whether you manage a school, healthcare site, commercial office or industrial plant, we help you protect air quality where it matters most.
