Biasi Riva Plus Installation And Operation Instructions Manual page 26

9. Venting Cont.
F Standard Vertical-roof kit (Exhaust & intake outside)
This kit allows vertical termination of the flue pipe through the roof. The kit is 1.2 min length.
Extension pieces (Co--axial) are also available which allows the flue system to be extended
to a total overall maximum permissible length.
Optional 45° and 90° elbows can be used to offset the flue route.
Each additional elbow reduces the overall acceptable length of the flue system as follows:
45° reduce length by 1.6 ft.
90° reduce length by 3.2 ft.
Installation:
Drill hole through the outside roof.
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Cut the pipe as necessary.
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Slide the intake and exhaust pipes through the hole.
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Slide one rubber wall trim piece on the pipe from inside and one from outside.
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Connect exhaust (inner) pipe to concentric elbow.
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Connect intake (outer) pipe to concentric elbow.
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• Secure elbow to boiler using gasket and four screws provided.
Secure end cap on the intake pipe outside the house.
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26 Riva Plus Manual
Figure 9.8 (vertical pipe Φ 3.1 / Φ 4.9 in)