Majestic 3943108 - Back-Brick MBU36-SERIES - Used on Majestic fireplace models: TBUC36-MHF, TBUC36-MH, TBUC36-FH, MBUC36-MH, MBUC36, MBUC36-FH, TBUC36, TBU36, MBUC36-MHF, TBUC36 MHF, TBUC36 MH, TBUC36 FH, MBUC36 MH, MBUC36 FH, MBUC36 MHF, TBUC36MHF, TBUC36MH, TBUC36FH, MBUC36MH, MBUC36FH, MBUC36MHF