models 13503, 13520, 13523, 13525, 13528, 52500, 63500, EV-35B and all other brands of portable air cleaners that use a 15 x 10 x 3 cylindrical style HEPA filter . The size of the 24000 replacement HEPA air filter is approximately 14 1/2" diameter x 10 1/8" high x 2 1/2"