Riello DB 4 SM BLU Installation, Use And Maintenance Instructions page 26

2.4 Overall dimensions – Burner weight
347
FLANGE DIMENSIONS
Air duct connection
D7549
Fig. 4
6
1564
1049
164
702 515
Fixing to the boiler
Fig. 5
2
CHAPTER Burner description
740
453
D7939
Fig. 3
3 5 0
4 5 3
D7884
Fig. 6
287
Gas supply
6 5 , 5
D7885
1 4 5
1 8 5