FiltersFast Compatible Replacement for Five Seasons 9183940 MERV 11 Filter 2-Pack-16x22x5 (Actual Size: 15-3/8"x21-7/8"x5-1/4") Five Seasons 9183940 MERV 11 Filter 2-Pack-16x22x5 Replacement filter for the following Five Seasons systems: FSBB1620, FSMU1620, FSMU1620-A, FSNC1620, SAS-10EAC, SS-10EAC,FLAT Dimensions: 16"x22"x5"(actual size: 15-3/8"x21-7/8"x5-1/4") Made in the USA!