this what happens to a 24x24x2 pleated filter when it sticks to rack, cuz some A** H*** tech greased the already tight rails thinking that it would help. we all know what grease does when exposed to dirt and air, it becomes a sticky mess! had to break out the degreaser for rails and GOJO for my hands. then with a simple adjustment of rail positions..whaddaya know FILTERS SLIDE RIGHT IN!