Size Chart Fits Fireplace Opening Size Finished Frame Size Order Size Width Height Width Height 24 Hg 35"W x 3"D 2337-34 147 2410" 1/4036 1/4" 26 1/2" 28H x 35"W 1/4" 78 1/4" . 28 172" 30H 35"W x 3D oaf an-sang 38 1/47 -38 148" 3 a0 12 32H x 35"W x 37D 30/4732 1A 37 1 34H x 35"W x 3"D 32 447-34 148 34 142 24"H x 39"W x 3D 221/824 1/8" 28127 26H 1/4" 261/47.