Quote Originally Posted by awsomeears View Post
10 Merv is plenty, 11 is pushing it...

I have seen constent use of high 3M 15 Merv or higher filters burn out ECM DC blower motors !!!
That's what I was getting at. People don't realize how hard it is on blowers that aren't rated for higher MERV filters. It's not a matter of changing it more often.