I purchased 6 MERV 13 filers which is type MERV 13 not original MERV 13 filters, very bad quality , they come ripped and bended some of them. Very bad experience
Up until now have been using MERV 8. With the smoke from Canada decided to upgrade to the13 and found price sizing and were all I could ask for .What at this point I do not know and my furnace supplier could or would not say is if I would have enough pressure drop to negatively affect my furnace out performance.Am hoping the four inch pleated will do the job. Have just put in and seem to have at least a happy wife.