Hi. I know I am suppose to change my attic filters once a year. We have been in our house for 2 years now. Last year we replaced with the same filters. This year, as I was checking for prices, I stumbled on to this website. Please let me know if what I have is good and exactly how this filter differs from the ones we change out in the return air vents. We have 2 a/c units. This is the info. on the attic filters. Air Bear Filter Merv8 R6874
20x25x5. Trion Air Purification System. Reorder # is P.N. 255649-102.
Is this a good filter or should I be using something different? If so, what? Is this the type of filter that is suppose to help reduce allergens and dust? Thanks for your help.