FiltersFast Compatible Replacement for Aprilaire Space Gard 2400 16" x 27" x 6" (Actual Size: 15 3/8" x 26 15/16" x 6") 2 Pack Aprilaire Space Gard 2400 Compat. 16" x 27" x 6" (Actual Size: 15 3/8" x 26 15/16" x 6") MERV Rating: MERV 11 2-Pack For Added Convenience Energy Efficient - Saves You Money! Pre-Assembled For Easy Installation