Chimney Masters Blog

A prefabricated (factory-built) fireplace is safety-tested and listed as a complete system — firebox, chimney sections, termination and clearances all matched. NFPA 211 directs that factory-built fireplaces and chimneys be installed according to the manufacturer's listed instructions, and mixing brands, shortening clearances or improvising the vent falls outside that listing. A professional installer sizes and routes the venting, holds the clearances to combustibles set out i