Bosch AZB-922 adapter coaxial with DN 80/125 to 80/80 mm

Basic element for connecting the boiler to a separate flue/air line system.
Coaxial system (like "pipe in pipe"), designed to supply air and exhaust combustion products.
Air intake through a pipe 80 mm.
Exit of flue gases on a pipe of 125 mm.
Separate system 80/80 mm for the removal of combustion products and air supply from outside the room (two separate pipes).
For condensing boilers with a closed combustion chamber of any manufacturer with an outlet of 80/125 mm.