Designed exclusively for Lennox Merit Series and Superior wood- and gas-burning fireplaces, the selection of twin-pane or bi-fold doors and fixed panels delivers the perfect touch for any preference. The bi-fold doors, with four glass panes, offer smooth and effortless opening in tight spaces. Twin-pane doors provide a virtually unbroken view of the fire with two large, metal-trimmed glass panes. And the fixed-panel doors, available for gas fireplaces, creates the attractive look of a bi-fold door with a seamless frame that does not open. Lennox 12M07 38ABF Aluminum Bi-Fold Door Black Used for Lennox fireplace models CPF-38 and CST-38 and Superior Fireplace Models BCF 3885 , BRF 3875 , BRFI 3875, CF 3860, CPF, CST after 8/2000 , GHC-6500EN, GHC-6500EP, GHC-6500N, GHC-6500P, GRD-6500EN, GRD-6500EP, GRD-6500N, GRD-6500P, HC 3820, HC 3820A, KC-38-3, KC-38C, KR-38, KR-38-2, KR-38-3, KR-38C and CST before August 2000 Part # / Catalog # 052011, 051991, 11M96, 037631, 65995,11M94, 037633, 065993, 016811, 052011, 051991, 059361, 059362, 059351/H, 059352/H, 059381, 059382/H, 059371, 059372, 011402, 036532, 064478, 044555, 044553, 056373, 064477, 044557 and 051991 check year of MFG, if it is a wood burning fireplace which was manufactured before August 2000, a door track kit may be required.