Lennox - 52L53 / 164617A - Hearth / Bottom Refractory Panel Used for Lennox Fireplace Model B36HCI , BCF-36, BCFI-36, BCI-36 and Marco Fireplace Models BR-36, BR-36-2, BBV-36REN & BBV-36REP Part / Catalog #'s 792776B/D, 70L41, 70L42, 11M87, 11M82, 11M90, 66L38 & 66L39