Fireplace
((Front width (A) + Back width (B))/ 2 x Fireplace Depth (C) x glass depth (D)/19 = glass (LBS.)
We recommend a glass depth of 2"" -4 ""for most fireplaces. For rectangular and square fireplaces, use the same front width as the back width. For example, a front width 25"" ,back width 20"",fireplace depth 18"" of fire pit at the recommended 2” of fire glass depth: (25+20)/2X18 X 2/19 = 43 (lbs).