Riello DB 16 SM C01 TC A0 FS1 T250 Installation, Use And Maintenance Instructions page 26

2
CHAPTER Burner description
2.4 Overall dimensions
20069961
Fig. 3
FLANGE DIMENSIONS
Air duct connection Fixing to the boiler Gas supply
1 8 0
DN 100
D3893
D7797
Fig. 4 Fig. 5 Fig. 6
6