Semi-related, for 99% of residential HVAC setups MERV11 filters will end up performing WORSE than a MERV8 level filter.
People get caught up too much on the small particle capture aspect of a MERV11 filter, but long story short, the #1 thing that helps get pollutants out of your air is volume of air movement through your filter.
A MERV8 filter will, in most cases, allow significantly more air volume movement, and by extension result in greater net particle capture, than a MERV 11 filter. You might actually find that your filters get dirty faster, which indicates they are working, and then you'll also appreciate that MERV8's are typically much cheaper than MERV11's.
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