Filter King Merv 8 6.88x15.88x1 6-Pack Air Filter actual size is 6.88x15.88x.75. Our 6.88x15.88x1 Furnace Filters are designed to last up to 90 days. These pleated 1-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 6-22/25 x 15-22/25 x 3/4