Do Air Filters Restrict Airflow? An Expert's Perspective

Learn how air filters affect airflow in your home and how to choose the right filter for maximum performance and energy efficiency.

Do Air Filters Restrict Airflow? An Expert's Perspective

If you're concerned about the air quality in your home, you may be wondering if air filters restrict airflow. The answer is yes, all air filters will restrict airflow to some degree. However, the extent of the restriction depends on the type of filter and the size of your HVAC system. When it comes to air filters, the MERV rating is an important factor to consider.

A filter with a higher MERV rating will reduce airflow more than one with a lower rating. Additionally, the size of the filter and the type of fan motor in your HVAC system can also affect airflow. If your air filter is dirty, it can cause low air flow and make your entire HVAC system work harder. This can lead to an inefficient system that can't provide enough heating or cooling to your home.

It can also cause liquid to flood back into the compressor, leading to premature equipment failure. HEPA filters are incredibly dense and usually require an additional fan to push air through them. This can reduce airflow in the duct system and quickly fill with particles, blocking airflow even more. As the filter becomes dirtier, the PSC motor will provide less airflow.

High MERV pleated filters are great for capturing contaminants, but they also restrict air movement into the blower or oven. This makes the fan work harder and reduces efficiency. To avoid this problem, you should choose a filter with a lower MERV rating or one that is specifically designed for your HVAC system.It's important to remember that all air filters will restrict airflow to some degree. However, if you choose the right filter for your unit and overall system, you can reduce pollutants in the air while still maintaining good airflow.

We recommend changing your air filters every 1-2 months to maintain maximum performance and energy efficiency.If you have questions about which filter rating is suitable for use with your HVAC system, ask your HVAC technician for professional guidance. Don't be fooled by “hype” about rating systems, cleanable filters or electrostatically charged filters – these won't help you maintain good airflow.