Biasi Riva Plus Combi Installation & Operation Instructions page 22

9. Venting Cont.
D Alternative separate kit (Exhaust outside & intake inside)
This confi guration of the twin pipe kit allows to discharge the exhaust gasses outside. The air
supply is obtained with an air intake pipe. This allows to take air from the room where the boiler
is installed.
If either an additional 45° or 90° accessory elbow is used then the maximum permissible lenght
of either pipe must be reduced by 3.0 ft or 5.4 ft respectively.
Note: When utilizing this option, see page 14 for room ventilation details.
Installation:
• Drill hole C (on the wall template) through the outside wall Drill hole C (on the wall tem-
plate) through the outside wall that is less than 18"thick.
• Cut the pipe as necessary so that no more than 6" protrudes from the house.
• Slide the exhaust pipe through the hole.
• Slide one rubber wall trim piece on the pipe from inside and one from outside.
• Attach each collar to the boiler with the gasket and screws provided.
• Insert each elbow into its corresponding collar.
• Connect each pipe to its corresponding elbow.
22 RIVA PLUS COMBI MANUAL
Figure 9.6 (Twin Pipe Ø 3.25 in)