I was using a washable filter and then I started getting system error messages on my thermostat. The HVAC technician ran several tests which determined the filter was causing an air blockage and recommended a merv 8 filter. I have had no error messages since installing this new filter. It's a good filter at a good price and it meets the merv 8 requirements. BTW I couldn't find any filters rated merv 8 in my local larger stores. They only sold Merv 11 or higher, which the technician said could also result in an air blockade.
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