What Does MERV Mean in Air Filters?

MERV stands for Minimum Efficiency Reporting Value, which is a standard rating system used for how effectively air filters capture airborne particles. The MERV scale range is from 1 to 20. Higher MERV ratings ensure more filtration. Picking the best  MERV rating for your home depends on your specific air quality needs and HVAC system. The MERV rating system was created to make it easier to compare performance for different filter types and brands.

How MERV Ratings Work: The Basics

MERV ratings measure when an air filter captures dust, pollen, microscopic allergens, and bacteria. Higher MERV numbers provide finer filtration. 

• MERV 1–4: Captures large particles with minimal filtration.

• MERV 5–8: Traps mold spores, household dust, and pet dander.

• MERV 9–12: Filters fine particles like lead dust, auto emissions, and some bacteria; ideal for homes needing improved air quality

• MERV 13–16: Removes smoke, viruses, and airborne allergens; used in hospitals and high-efficiency residential systems

• MERV 17–20: Ultra-high filtration for surgical environments; offering HEPA-level performance

Comparing MERV 8 vs MERV 11 vs MERV 13

Choosing between MERV 8, MERV 11, and MERV 13 filters depends on their compatibility with your HVAC system and your air quality needs because each rating serves a different purpose. When you need basic filtration, MERV 8 filters are adequate. If you have pets or moderate allergies, you can use a MERV 11 filter. MERV 13 filters provide high-efficiency, superior air purification to filter out smoke, bacteria, and fine particles. Before you choose the best MERV rating for your home air filter, make sure it corresponds with your HVAC unit’s capabilities. 

Can a High MERV Filter Damage Your HVAC System?

While high MERV filters provide superior filtration, if the filter isn’t designed for high resistance or changed frequently, unintended consequences can develop. The tighter weave in high MERV-rated filters makes it more difficult for air to pass through, even though it effectively traps microscopic particles. They can also sometimes result in overheating or failure of system parts when dirty filters remain in use. Make sure to change out your filter at regular intervals to ensure your HVAC unit has the right balance between air purification and system efficiency.

How Often Should You Replace Your MERV Filter?

Dirty filters slow down airflow and cause HVAC system difficulty in maintaining comfortable temperatures. A dirty air filter can cause your utility costs to rise and lead to HVAC unit damage. Overworked systems are more prone to breakdowns. Replacing the filter every 30 to 90 days will help you avoid repairs and keep your air quality healthy.

Shop by MERV Rating: Find the Right Filter for Your Home

If you're shopping for air filters online,  you can narrow them down by browsing filters with MERV ratings at Air Filters Delivered. Whether you’re seeking basic dust control or superior allergen protection, we have a wide selection of air and furnace filters available in various sizes and MERV ratings. Access our website and compare filters to fit your HVAC system and air quality needs.  Our bulk ordering and subscription options are conveniently shipped to you.