George,
We were using the 3M filters found in the stores in the area, but we noticed a great deal of dust in our home. The performance ratings of those filters were around 350 to 500. So I went on line to find a high performance filter. I found a 3M filter called Filtrete Elite Allergen, with a rating of 2200, advertised to capture 94% of airborne allergens. The site I used was
Filters4Life, and I think they were a reasonable price. We notice far less dust. We change them every 3 months, and they are full of dirt.
Hope this helps.
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