Pure Copper Chimney Cap shape diamond,square,round Important part of the fireplace usage filter,screen,fence Pure Copper Chimney Cap 1. feature All of the chimney caps are made of pure copper, 16gauge, 1.5mm.2. Production process 1), making CAD drawing with detailed dimensions2), Preparing the copper material3), flaming the copper 4), copper tig welding5), Polishing6), making the patina7), ...