HEPA filters are renowned for their remarkable filtration performance, but they can also reduce airflow in some home comfort equipment. The MERV rating of an air filter describes its efficiency in eliminating particles between 0.3 and 10 microns in the air passing through it. While air filters are usually used to reduce indoor air pollution, they can also reduce airflow if they are dirty, inefficient, or too efficient. According to the World Health Organization (WHO), air quality in homes, offices, schools, day care centers, public buildings, health centers, and other public and private buildings is essential for healthy living and well-being. I recently tested the interior air quality index (AQI) in my cabin with a portable air quality monitor and was amazed at how well HEPA filters work.
These filters are the only mechanical air filters that are tested and certified to meet a specific efficiency with a specific particle size. For example, if 10,000 0.3 micron particles are introduced into a HEPA filter, only 3 particles can pass through. Studies have also shown that HEPA filters can improve bronchial hyperreactivity by decreasing the FEV1 delta (compared to FEV1 before and after exposure to cold air). Air purifiers that capture large amounts of allergens and dust particles can also improve respiratory function. Every day, 10,000 liters of air enter the lungs to extract 420 liters of oxygen – a vital process for human survival and functioning. Investing in a HEPA filtration system – if it is the right size for the space – will go a long way in providing clean air and peace of mind to everyone in the building.
An epidemiological survey conducted in hospitals over three decades (1979-2000) on children under 18 years of age showed a steady increase in asthma prevalence from 9% to 25.5%. This increase is attributed not only to genetic predisposition but also to urbanization, air pollution, and environmental tobacco smoke. Air purifiers use thick pre-filters and Rota filters to capture small dust particles when rotating at high speed. There are now technologically advanced air filter systems that effectively remove particles, providing significant health benefits for patients with asthma and cardiovascular diseases. However, this level of filtration in an average household system can dramatically reduce airflow. The role of air pollution in the development of respiratory diseases – including acute respiratory infections and chronic obstructive pulmonary diseases – is well known. In conclusion, HEPA filters are an effective way to reduce indoor air pollution but they can also reduce airflow if they are too efficient or dirty.
It is important to invest in the right size filter for your space and regularly maintain it to ensure optimal performance.
