15 Degree Stainless Steel Elbow 

Chimney liner elbows are made of acid-resistant chrome-nickel steel plates in grade 1.4404 according to DIN 17441 with a thickness of 0.5mm to 0.8mm 

They are mainly used for flue heating equipment

Such chimneys are resistant to the corrosive effects of acidic condensate formed during the combustion process