If you're swapping out a Honeywell or Lennox air filter sized 16x25x4, or using an MPR-rated filter with a true depth of 4 3/8 inches, we recommend considering our 16x25x5 filter (with a true depth of 4 3/8 inches).
Nominal Size: 16 x 25 x 4, Actual Size: 15 1/2 x 24 1/2 x 3 5/8 (15.5 x 24.5 x 3.63)
Measure your air filter for the exact size and compare it to our actual size to ensure proper fit.