HEPA filters are the gold standard in hospitals and clinics, as they are able to remove 99.97 percent of particles up to a size of 0.3u. This level of air filter is extremely efficient, ranging from 17 to 20 on the MERV scale. However, when used in the average home system, this level of air filter drastically reduces airflow. It's important to find the right air filter to remove contaminants from your home while maintaining a constant airflow.
Low-efficiency air filters should work well if they are routinely changed, and an air filter that is effective within the range of 0.3u to 10u will pick up even the smallest mold spores. The airflow restriction imposed by HEPA filters in the duct in residential air conditioning systems decreases energy efficiency, reduces performance and can lower indoor air quality by causing pressure imbalances. Excessive filtering causes a lack of air flow and can cause heat exchanger heating failures and inner coil freeze cooling failures. Air filter efficiency refers to the relative ability of a filter to remove particles of a size or range of given sizes of air passing through the filter.
Dirty air filters significantly reduce airflow, making it difficult for the HVAC system to function properly. This method continuously filters a percentage of the domestic airflow according to HEPA standards without restricting the volume of air through the duct. In conclusion, while HEPA filters are great for standalone air filters and particular uses, they can reduce airflow in an average home system. It's important to find the right air filter that will remove contaminants from your home while maintaining a constant airflow.