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Filters come in all different levels of filtering. Is your house newer and relatively dust free? Do you have allergies? Is your system in a dusty location? (my inside unit is in my garage, which I converted to my woodshop)
Filters effectiveness is based off of a merv rating. Here's a chart of what the ratings mean.
Here's a link to a very high MERV rated filter that will do a great job. They aren't cheap though
Do you have ant other questions or concerns?