Installation
Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
40
Direct vent installations (sealed combustion)
For direct vent applications all applicable items below must be met.
Fig. 30 Vent & combustion air pipe position of a sealed combustion
system
[1] Intake
[2] Exhaust
X At least 1 foot (305mm)
Y At least 1 foot (305mm) above grade, roof or anticipated snow
line
The termination shall terminate at least 1 foot (305 mm) below, 1 foot
(305 mm) horizontally from or 1 foot (305 mm) above any door, window
or gravity air inlet into any building ( fig. 31 [2], [X1], [X3]).
If multiple boilers are installed in a row, allow at least 1 foot (305 mm)
clearance between the vent termination of one and the combustion air
intake of the other.
Vent termination must be at least 1 foot (305 mm) above grade,
anticipated snow line or roof surface (Canada 1½ feet (457 mm)
minimum) ( fig. 31 [YA]).
Vent termination must be at least 7 feet (2135 mm) above a public
walkway ( fig. 31 [X5]). Ensure that condensate spilling from the
termination does not create a hazard or a nuisance.
Vent termination must be 3 feet (915 mm) above any forced air intake
within 10 feet (3050 mm) ( fig. 31 [1], [YB]).
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 feet (915 mm) away from adjacent
walls, inside corners and 5 feet (1525 mm) below roof overhang ( fig.
31 [X2], [X4]).
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 fireplace is vented
into or through chimney.
All PVC/CPVC vent pipes must be glued, except for the flue gas adapter
pipe connection.
The exhaust pipe must be properly supported and pitched a minimum of
¼” (6.35 mm) per foot back to the boiler. This allows the condensate to
properly drain.
NOTICE:
Combustion air and vent pipe materials for KBR42-3A & KWB42-3A.
Heat damage to 2” PVC pipes.
▶ KBR42-3A & KWB42-3A appliances combustion air and vent pipes,
use 2” CPVC-pipes or 3” pipes.
X
X
XYX
1
2
6 720 810 590 -81.1Wo
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