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:
EX 700, EX 850
Exhaust Pipe Size Maximum Equivalent Length
Sched.40; Rigid PPs
6" PVC/CPVC / Rigid PPs/SS 120' (each side)
90° vent elbow allow 5' equivalent
45° elbow allow 3' equivalent
PPs 87-90° elbows use 5' equivalent
Table 5 Maximum Exhaust Venting Length for EX 700, 850
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 9 Pipe and fitting beveling
Check that material meets local codes including fire stopping requirements. Some local jurisdictions
require a minimum initial length of pipe be exposed or accessible for inspection. Pipe clearances -
no IBC requirements; follow local codes. All piping must be liquid and pressure tight.
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