I bought the Merv 11 its amazing. No dust at all and its been 2 weeks. Unfortunately, I measured without slotting room for the metal door to close . Its a little too big. It did force it inside but for the money I should have been more careful. It needed to be 1/2 inch smaller
Actual size is less than normal filters with this dimension (by around 1/4") leaving a gap around the edges and resulting in an air leak; not ideal for air filters. 20 x 20s are not actually 20 x 20 but it was my assumption that all 20 x 20s would be the same. My mistake, I guess, but irritating. I'll tape around the sides but I shouldn't have to do that.
i move to a different address and a different size filter.isent a message 3 times to let you know my new address and new filter size this is the second time i had to go to my old address to pick up the filters and they are the wrong size. dont send any more filters you had to chances to get it right i now have 4 filters that are the wrong size dont send any more filters i am locking you from my account