Generalaire / ReservePro Part # GF 4541 MERV 11 16x25x5 With Foam Gasket For Mac 1400. Actual Size 15 5/8" x 24 1/4" x 4 7/8". Case of 3New MERV 11 Rated, 16 x 25 x 5 GF 4541 Replacement Filter for ReservePro GF4511 Mac 1400 Actual Size 15 5 8" x 24 3 16" x 4 15 16" (with foam strips) Will replace MAC1400, GF4511 16 x 25 x 5 MERV 10 Fits GeneralAire MAC 1400, 2400 and GF1625 11 Also Fits Trion Air Bear Supreme 1400, #255649 105, Source1 S1 MAC10162505, #S1 FM10162505, Skuttle DB0 0025 016, #448 1 and Ultravation 90 006, #91 005 Package of 3