Pipe sections combine corrosion-resistant stainless steel and sturdy galvanized steel for strong chimney construction. Lightweight pipe with snap-lock joints offers faster, easier installations. Features a space-age refractory blanket between the stainless steel/galvanized walls to withstand intermittent temperatures up to 2100 deg F as called for in UL 103 HT Standard. Requires 2 in air space to combustibles.