Direct Vent" Combustion Air Intake Piping - IBC SL 20-160 G3 Installation And Operating Instructions Manual

WARNING
In addition to preventing
ingestion of chemical
contaminants, care must be
taken to ensure air intake
terminals are not installed in
locations where contamination
might occur due to ingestion of
particulate foreign material (dust,
dirt and debris).
WARNING
Intake air openings must be
configured such that rain or
other forms of moisture cannot
enter the air intake piping
system. Otherwise serious
damage to the boiler may result.
INTAKE PIPE SIZE
Sched.40; Rigid PPs
2"
3"
90° vent elbow
90° long sweep elbow
45° elbow
PPs 87-90° elbows
Air Intake Filter (Part #103)
2" Stainless Sidewall Terminal
IBC P/N 180-148 (P-256)
3" Stainless Sidewall Terminal
IBC P/N 180-149 (P-257)
Flexible PPs
3" Flexible
NOTE
Care must be taken when
installing air intake piping to
ensure that a "trap" is not formed
in the piping so as to allow a
build-up of water, and blockage
of intake air.
Such blockage will result in a
boiler safety shut-down.
1-14
SL 10-85 G3, SL 14-115 G3, SL 20-160 G3, SL 30-199 G3 MODULATING GAS BOILERS SL 10-85 G3, SL 14-115 G3, SL 20-160 G3, SL 30-199 G3 MODULATING GAS BOILERS

1.4.7 "Direct Vent" Combustion Air Intake Piping

There are two basic methods of supplying combustion air to an IBC boiler.
The direct vent option uses piping from the outside to supply combustion air directly to the
boiler's combustion air connection.
Figure 19: Direct vent combustion air intake
MAXIMUM EQUIVALENT LENGTH
SL 10-85 G3 SL 14-115 G3
100' 100'
240' 240'
allow 8' equivalent allow 8' equivalent
allow 5' equivalent allow 5' equivalent
allow 3' equivalent allow 3' equivalent
use 8' equivalent use 8' equivalent
allow 8' equivalent allow 8' equivalent
No additional No additional
allowance allowance
No additional No additional
allowance allowance
45' (max.) lineal x 3.33 45' (max.) lineal x 3.33
= equivalent = equivalent
Table 4: Maximum intake piping length.
NOTE: It is not permitted to add to the exhaust length by transfer of unused intake
allowance.
SL 20-160 G3
35'
170'
allow 8' equivalent
allow 5' equivalent
allow 3' equivalent
use 8' equivalent
Not allowed
No additional
allowance
45' (max.) actual
lineal x 3.33 =
equivalent
INSTALLATION AND OPERATION INSTRUCTIONS
SL 30-199 G3
Not applicable
150'
allow 8' equivalent
allow 5' equivalent
allow 3' equivalent
use 8' equivalent
Not allowed
No additional
allowance
30' (max.) actual
lineal x 3.3 =
equivalent