Filter King Merv 8 17.5x22x2 6-Pack Air Filter actual size is 17.5x22x2. Our 17.5x22x2 Furnace Filters are designed to last up to 90 days. These pleated 2-inch air filters are ideal for maintaining the efficiency of your heating and cooling systems. Make sure you measure your filter. The actual size of this pleated Merv 8 filter is 17-1/2 x 22 x 2