FPR Filter Ratings
When it comes to rating the effectiveness of furnace and air conditioning filters, manufacturers typically use one of three main rating systems. These three main rating systems are MERV (Minimum Efficiency Reporting Value), FPR (Filter Performance Rating), and MPR (Micro-Particle Performance Rating). If you’re wondering why in the world there are three separate rating systems just to measure how well filters work (or don’t work), the answer is simple: they were created by different organizations. While MERV was created by a group called ASHRAE (American Society of Heating, Refrigerating, and Air-Conditioning Engineers) and is considered an “industry standard” way to rate filters, the FPR rating system was created by The Home Depot after they did away with all of the MERV-rated filters in their stores, and MPR was developed by 3M.
One of the common complaints about FPR and MPR ratings is that it is difficult for most people to do filter comparison shopping when comparing a MERV-rated filter to an FPR or MPR-rated one. Unless you did your own testing, you would have no choice but to take the manufacturers’ word for it.
How Do the Industry-Standard MERV Ratings Compare to FPR Ratings?
As noted, the FPR system was developed by The Home Depot. FPR utilizes a color coding system as well as a numeric scale. There are many different Home Depot filter brands sold in their stores, including Honeywell, Rheem, WEB Products, and so on and so forth, and all of these are rated on the same FPR scale. The scale ranges from a low of 4 to a high of 10.
The FPR System
- “Premium” filter: FPR 10
- “Best” filter: FPR 8
- “Better” filter: FPR 6
- “Good” filter: FPR 4
When it comes to comparing MERV to FPR, though, that’s when things get tough. The Home Depot website claims that FPR 8 filters are equivalent MERV 11 filters, which may or may not be true. The only way to prove this claim would be to test both of them independently using the same methods.
How Are Purity Filters Rated?
We don’t rate our filters because we think rating systems can be unreliable, and we don’t want to mislead our customers with scaling systems. Simply put, we don’t think a rating system is needed. Instead, we simply let our customers know what kind of particulate matter our filters can adsorb, trap, and filter out of rooms, and we think that’s more than enough for them. Our filters can trap and reduce lint, allergens (including pet dander), dust mites, smelly odors, mold particles, pollen, smoke, and much, much more.
Why use a filter rating system when you can simply let your customers know what the filter can do?