The same as my smaller ones I talked to a reap again she sent me the wrong size she sent me germguardian filter size B they are way to short, I called them back she said thier is nothing you can do because it has been to loon, so I got three germguardian purifiers that i can not use and have not used in overa year, THAT IS WAY I WILL SHOP SOME WEAR USE IN THE FUTHURE. And three  gyrategirl purifiers.