Filter should be changed every 6 months..
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FIB0021F
Product Photo Bryant/Carrier Replacement Media for FIB0021 by FUSA
Fits FNCCAB-0021
FILBBFNC0021,FILCCFNC0021, FILXXFNC0021, FILXXFNC0121, DPFPCC0021,
Actual Size 19-1/8x19 3/4x4 5/16" MERV 8, 4-C-1920-8(SBCRF20205)(50001-102-0173)old number FIB0021
GREAT BUY, MADE IN THE USA
2 Pack Special Regularly $96.00 Special NOW $54.95