Buderus Logamax plus Installation Instructions Manual page 25

Vent must be at least 12 inches (305 mm) above grade,
anticipated snow line or roof surface (Canada 18" (457 mm)
minimum) (see fig. 21).
Vent termination must be at least 7 ft (2,135 mm) above
a public walkway (see fig. 22).
Vent must be 3 ft (915 mm) above any forced air intake
within 10 ft (3,050 mm) (see fig. 22).
Do not extend exposed vent pipe outside the building
beyond recommended distance. Condensate could freeze
and block vent pipe.
Vent should terminate at least 3 ft (915 mm) away from adja-
cent walls, inside corners and 5 ft (1525 mm) below roof
overhang (see fig. 22).
It is not recommended to terminate vent above any door or
window, condensate can freeze causing ice formations.
Do not use chimney as a raceway if another boiler or fire-
place is vented into or through chimney.
All non-steel vent pipes must be glued, except for the flue
gas adapter. Installed you can slide the pipe onto the
adapter, properly supported and the exhaust pipe must be
pitched a minimum of a ¼ inch (6.35 mm) per foot back to
the boiler. This allows the condensate to drain away.
All non-steel combustion air and vent pipe materials and
fittings must comply with the following and must be UL
approved venting material:
Item Material
PVC schedule 40, 80
4" (100 mm) Vent or air
PVC-DWV
pipe and fitting
CPVC schedule 40, 80
PVC
Pipe
cement/ primer
CPVC
* Components of the certified vent systems must not be interchanged with other vent systems or unlisted pipe fittings Plastic components, and specified
primers and glues of the certified vent system must be from a single system manufacturer and not intermixed with other system manufacturer's vent
system parts.
Approved flue material are from:
Roof terminals
4"/6" (100/150 mm)
4" (100 mm)
Wall terminals
4" (100 mm)
90°-elbow with inlet screen
NOTICE
- DO NOT use cellular core pipe.
- DO NOT use PVC when using anti-freeze in the primary circuit of the boiler. Use CPVC or stainless steel only!
Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!
Flue System (trade name)
concentric PVC
parallel stainless steel
Flue System (trade name)
parallel stainless steel
PVC/stainless steel
12" (305 mm)
minimum
12" (305 mm)
minimum
Fig. 21 Vent and air pipe position (1) of a sealed combustion
system
United states
ANSI/ASTM D1785
ANSI/ASTM D2665
ANSI/ASTM F441
ANSI/ASTM D2564
ANSI/ASTM F493
Supplier
IPEX
Flex-L
Supplier
Flex-L
Z-Flex/Heat Fab
Installation
12" (305 mm)
minimum
EXHAUST
INTAKE 12" (305 mm)
minimum
12" (305 mm)
minimum
Canada
BH Gas venting
systems,
ULC S636 *
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