IBC SL Series Installation & Operating Manual page 29

Intake/Exhaust
45° elbow
PP 87-90° elbows
3-inch Stainless Sidewall
Terminal IBC (P-257)
3-inch PP flexible pipe
Table 5 Maximum air intake pipe and maximum exhaust vent length - SL 26-260 G3
Intake/Exhaust
4-inch rigid pipe
90° elbow
90° long sweep elbow
45° elbow
PP 87-90° elbows
3-inch Stainless Sidewall Terminal
(SST) IBC P-257
3-inch CPVC (to adapt to the SST) for each 1 ft allow 3.2 ft equivalent
4-inch PP flexible pipe
Table 6 Maximum air intake pipe and maximum exhaust vent length - SL 40-399 G3
Notes
Unused intake travel cannot be added to the exhaust. Unequal intake and exhaust
piping is allowed.
Support should be provided for intake and vent piping, particularly for horizontal runs
(follow local code).
Example of equivalent length calculations for an SL 40-399:
An SL 40-399 G3 can be sited up to 200 feet (actual vent length allowance) from the vent
SL 26-260 G3
Maximum Equivalent Length
allow 3 ft for each elbow
allow 8 ft for each elbow
Intake: No additional allowance required
Exhaust: Allow 20 ft
Limited to a maximum of 60 ft
Allow 3.3 x actual length (e.g., 10 feet of 3-inch flexible pipe
x 3.3 = 33 feet of rigid pipe)
SL 40-399 G3
Maximum Equivalent Length
200 ft (each side)
allow 8 ft for each elbow
allow 5 ft for each elbow
allow 3 ft for each elbow
allow 8 ft for each elbow
Intake: No additional allowance required
Exhaust: Allow 65 ft
Limited to 160 ft maximum
Allow 1.2 x actual length (e.g., 10 feet of 4-inch flexible
pipe x 1.2 = 12 feet of rigid pipe)
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3.7.4 Direct vent