I have returned!!!
Now, before you guys get upset let me state that this thread is about a guy returning to the regular MERV 8 filters.
I have two returns, one is a 16X20X1 and the other is a 20X20X1. For the 16X20 I use a NaturalAire filter (8 Merv) and for the 20X20X1 I was using a 3M Filtrete. Like you all said, the Filtrete loaded up fast so I had to replace it every month (2 months was the longest it would last). I have one more left and noticed something funny on the packaging. It now states (in bold letters with red background) on the cover.
THE INFORMATION ON THIS STICKER SUPERSEDES THE INFORMATION ON THE PACKAGE.
This filter does not outperform all other 1" filters. THIS FILTER IS RATED AT MERV 11 AND ITS MPR IS UNDER 1250. However, it does outperform all fiberglass, non-electrostatic pleated, and washable 1" filters.
1)So, what is the point of MERV? Is it simply a rating of restrictiveness?
2)Does one need anything over a MERV 8?
3)Is there a difference among manufacturers (NaturalAire, American, etc)?