27-1/2 x 29-1/2 x 1 (Exact Size) BioAir Electrostatic Washable Permanent A/C Furnace Filter - DESIGNED FOR GEOTHERMAL UNITS - Save $$$ - Just Vacuum or Hose Off and Reuse - 27.5x29.5x1

27-1/2 x 29-1/2 x 1 (Exact Size) BioAir Electrostatic Washable Permanent A/C Furnace Filter - DESIGNED FOR GEOTHERMAL UNITS - Save $$$ - Just Vacuum or Hose Off and Reuse - 27.5x29.5x1