Understanding the Difference Between FPR and MERV Ratings and How They Affect Filter Cost

When it comes to air filtration, there are two main rating systems used to classify filters: FPR and MERV. The FPR system, which stands for Filter Performance Rating, was developed by Home Depot based on their tests. The MERV system, on the other hand, is an industry standard used around the world. In this article, we'll explore the differences between these two rating systems and how they affect filter cost. The MERV system classifies air filters strictly based on their ability to capture particulate matter.

The FPR system goes one step further and also classifies filters based on the amount of pressure drop they introduce and their dust-holding capacity. The FPR ratings are on a scale of 4 to 10, while the MERV classification is domestic and commercial. To better understand how filters classified with FPR and MPR compare to those of the more standard MERV classification system, you can use the following table:FPR Rating | MERV Rating | Pressure Drop | Dust-Holding Capacity
4 | 6 | Low | Low
5 | 8 | Low | Medium
6 | 11 | Medium | High
7 | 13 | High | HighThe main difference between the FPR and MERV classification systems is that the FPR system takes into account the pressure drop and dust-holding capacity of air filters, aspects that MERV and MPR systems do not solve. This means that a higher MERV rating may mean slightly more restricted airflow; however, most current HVAC systems are capable of handling a MERV 11 air filter without overloading the system. In addition, filters with an RPF rating of 4 to 5 will not restrict airflow as much as filters with a higher RPF rating. The main drawback of using filters with an RPF rating of 8 to 9 is that they will reduce airflow more than filters with a lower RPR rating.

Newer units shouldn't have airflow problems with higher MERV ratings, although older models can work harder with a MERV 13 filter installed than when they originally had a MERV 6 filter in the air intake. MERV 11 air filters provide greater filtering power against fine particles compared to MERV 8 filters. And MERV 13 air filters provide even greater filtering power against fine particles compared to MERV 11 filters. When it comes to cost, it's important to consider both the initial cost of the filter as well as its long-term cost. Generally speaking, higher-rated filters tend to be more expensive than lower-rated ones. However, higher-rated filters also tend to last longer than lower-rated ones, so they may be more cost-effective in the long run. In conclusion, when choosing an air filter for your home or business, it's important to consider both the FPR and MERV ratings.

The FPR system is a more complete classification system for air filters compared to the MERV and MPR systems. It takes into account both pressure drop and dust-holding capacity, which can help you make an informed decision about which filter is best for your needs.