Merv Ratings and Indoor Air Quality
What does it all mean?
Choosing the right air filter can help keep your indoor air clean and your furnace running smoothly! But when it comes to replacing your filter what does the MERV rating mean and how does it effect air quality?
Technically speaking it stands for:
- MINIMUM
- EFFIENCY
- REPORTING
- VALUE
But basically, it’s a measure of how effectively your filter will capture particles that pass through as your furnace does its job. The higher the MERV rating, the smaller the particles that will pass through.
Is a higher rating better for you? Yes, but a balance between your budget and needs can be found. The chart below highlights the various MERV levels and the particles that are captured.
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Dust & Lint |
Pollen |
Dust Mites |
Mold |
Pet Dander |
Smoke |
Smog |
Cough & Sneeze |
Virus |
Bacteria |
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MERV 6 |
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MERV 8 |
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MERV 11 |
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MERV 16 |
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Or if charts are your thing, click this link to view a great breakdown of MERV ratings!
In our professional opinion if you are using a 1-inch filter do not go higher then a MERV 8 rating. The pleating inside the filter becomes too restrictive and can damage your furnace. For a 5-inch filter the MERV 11 or 16 is recommended.
Check out this video for a great visual on how your filter selection will affect your furnace air flow. It's worth the 5 minutes!
How often to change your filter? It is important to change your filters regularly to keep your IQA at its best and your furnace operating smoothly. A standard filter should be replaced every few months. Various factors like pets, number of people living in the home, if you smoke, or if you have allergies may affect the longevity of your filters. If you’re curious feel free to give us a call to discuss.
Need a new filter? Click here to go to our online store!