Warning
Follow all installation instructions supplied by the pipe and fitting manufacturer.
The actual vent travel allowance is reduced for fittings as shown in the following tables:
Exhaust / Fittings EX 400, EX 500 EX 700, EX 850
4-inch rigid pipe 170 ft (max.) each side Not allowed
6-inch rigid pipe n/a 120 ft (max.) each side
90° vent elbow allow 5 ft for each elbow
45° elbow allow 3 ft for each elbow
PPs 87-90° elbows allow 5 ft for each elbow
Table 4 Maximum Exhaust Venting Length for EX 400, 500, 700, and 850 models
For example, for an EX 850 using 6 x 90º CPVC vent elbows, the maximum lineal measure
of pipe allowed is 90 feet (120' – (6 x 5' = 30) = 90').
Note
Unused intake travel cannot be added to the exhaust. Unequal intake and exhaust piping
is allowed.
Exhaust venting must slope down towards the boiler with a
pitch of at least 1/4" per foot (PP vent: follow PP
manufacturer requirements for slope), so condensate runs
back towards the trap. Support should be provided for
intake and vent piping, particularly for horizontal runs (follow
local code
Figure 12 Pipe and fitting beveling
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