Ferroli Optima 901 Installation Instructions Manual page 31

Special Installation Possibilities: Two-pipe air intake/flue outlet
Special Air Intake/Flue Outlet
The standard Flue/air intake hood on top of the boiler can be replaced by a special two pipe flue adapter.
235
= Special two pipe flue adapter 823071
1
= remove air intake cover Ø 80 mm
2
480
901
1
2
31