Replacement Pre-filter for the Santa Fe Advance (Original) dehumidifier. These filters are original equipment products. Sold in a pack of 4 filters. Also available in a case of 12. Used in conjunction with either a MERV 11 or Odor Ban filter. Dimensions 11.75 x 11.75 x 1/4 Part Number 4025831 Does NOT fit Advance 2 unit.