
I upgraded the Merv-13 to the Merv-16 to filter more contaminants from the air. It's an annual replacement at least, but I weighed the difference between the old 213s I removed and the new 216s. The difference was 3 pounds. That tells me that maybe it should be changed every 6 months. 216 also helped get rid of the smell that appeared after replacing the system.

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