That makes a lot of sense. I haven't heard my blower struggling, so I've been using the 1500 or 1900 rated ones. I started with either 1000 or 1200, something like that. They keep upping them, though, and they're going to run out of names. "Ultra" was the tops at 1500, but then they got better and called the new 1900 ones "Ultimate." Now, it's "Elite" at 2200. I'm waiting for the 2500 rated "The Shizzle" filters.