Fire hydrant base fi 250mm KJ31/250

Acid-resistant base screwed with four bolts protects the chimney from atmospheric precipitation and also facilitates the assembly of chimney caps such as a spark arrester. Single-walled chimney liners are made of acid-resistant chrome-nickel steel sheets of grade 1.4404 according to DIN 17441 with a thickness of 0.5 to 0.8 [mm]. They are mainly used for removing flue gases from heating devices fired with gas or oil, operating under negative pressure. Such chimneys are resistant to the corrosive action of acidic condensate, formed during the combustion process. Water vapor condenses on the cold inner walls of the chimney and is drained through a condensation pan at the bottom of the chimney in the form of condensate. Condensation may occur during start-up or cyclic operation of the boiler.