I ordered several and buying expensive type for my new system that I have and for some reason they are a little too small. When the system shuts off the filter falls down and makes a sound hitting the cover. I ordered the correct size, so I don't know what is going on.
I purchase these several time a year, usually in packages of 3. This time I purchased 4 and they were not individually wrapped in cellophane like before. they were wrinkled, but I think they will work. why is there no individual wrapping?