How Much Does an Air Filter Reduce Air Flow?

Air filters are an essential part of any HVAC system, as they help to keep the air clean and free of contaminants. But how much do they actually reduce air flow? Recent studies have shown that high-MERV filters can reduce airflow by up to 11%, while medium-MERV filters can reduce airflow by up to 8%. However, there are many other factors that can affect the amount of airflow reduction, such as the size of the filter and the type of fan motor in your HVAC system. Additionally, if you leave a pleated air filter in your air return for too long, it will become clogged with contaminants and reduce airflow to zero.

This is why it's important to change your filter at least every three months for one-inch pleated filters, and every six months for pleated filters four or more inches. High MERV pleated filters are great at capturing a lot of contaminants, but they also restrict air movement to the blower or oven. This means that the fan has to work harder to heat and cool your home, which reduces efficiency. It can also cause liquid to return to the compressor, leading to premature equipment failure. When selecting an air filter, it's important to consider the MERV rating.

MERV values typically range from 4 to 14, and the filter packaging will tell you what type of contaminants the filter is capable of capturing. The Air Conditioning Contractors of America assumes that the pressure drop across a filter is 0.10 inches. At Sobieski Services, we understand how important it is to maintain healthy indoor air quality with efficient air filters. We are at the forefront of ensuring that your HVAC system is running smoothly and efficiently with the right air filter for your needs.