Derek Cole breaks down MERV ratings for air filters: higher numbers trap more particles but restrict airflow and can strain your system, while lower ratings let air flow freely but catch less. Pick the right balance for your HVAC or risk freezing and breakdowns.
How in the world can I choose which filter to use? There are so— I mean, look at this, a whole aisle of filters. So which one do you choose? So, uh, filters are rated by a MERV rating, what they call MERV rating. So the higher the number, the more efficient it is at collecting submicronic particles or Uh, particles you can't see, things that get in your system that you want to get rid of, that you don't want in your system. So the higher the number, the more efficient it is at collecting particles. The problem is the higher the number, the more restricts airflow. Airflow is the problem the higher the number you get. So the lower the number, the more stuff it lets through. The higher the number is really good at catching stuff, but it's really bad at airflow. Airflow is a challenge the higher the number you get, so you have to be careful. There is a give and take between the two. So you want a filter that collects particles, collects dust, collects dirt— it's pretty good at that— but at the same time allows for the airflow to get through. To the system so you don't have a freezing cold— you don't have a breakdown because this system has no airflow. So which one do I choose?
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