Biasi Riva Advance Combi Installation & Operation Instructions page 21

9. Venting Cont.
B Riser coaxial horizontal flue kit (Exhaust & intake outside)
Figure 9.2 (Coaxial 2.4/4.0 inches – nominal length 4.5 ft)
It can be mounted to allow discharge to the rear or either side of the boiler via the flanged boiler
adapter elbow. Minimum length required is 1.5 ft. Maximum equivalent length of 33 ft can be
achieved utilizing extensions. This flue system can only be used to discharge horizontally, it is
not designed to enable termination in the vertically.
Installation:
• Drill a hole 4.5" in diameter through the outside wall that is less than 18" thick.
• Cut the pipe as necessary so that a no more than 6" protrudes from the house.
• Slide the intake and exhaust pipes through the hole.
• Slide one rubber wall trim piece on the pipe from inside and one from outside.
• Connect exhaust (inner) pipe to concentric elbow.
• Connect intake (outer) pipe to concentric elbow.
• Secure elbow to boiler using gasket and four screws provided.
• Secure end cap on the intake pipe outside the house.
RIVA ADVANCE COMBI MANUAL 21