IBC SL 35-199 Operating Instructions Manual page 18

WARNING
When using Indoor
Air options, adequate
combustion air must be
supplied to the boiler room
according to the requirements
of all applicable codes.
1-12
SL 35-199, SL 45-260 MODULATING GAS BOILERS
EXHAUST PIPE SIZE
Sched.40; Rigid PPs
3"
4"
90° long sweep elbow
90° vent elbow
45° elbow
PPs 87-90° elbows
Flexible PPs
3" Flexible (SL 35-199)
3" PPs Flexible (SL 45-260)
4" Flexible
Table 4: Maximum exhaust venting length.
For the inlet air – Schedule 40 PVC, CPVC, ABS or PPs piping of any type is
permitted. Use same diameter as Vent pipe.
It is not permitted to add to the exhaust length by transfer of unused
NOTE:
intake allowance.
Combustion air piping - if used - is inserted directly into the 3" female stainless
steel fitting on the top, right side of the boiler and run horizontally or vertically to
the outdoors. Screen material can be placed at the inlet as appropriate for the
environment (e.g. insects, dust).
Care must be taken to ensure adequate separation is maintained between the
air intake inlet and the vent terminal. Refer to the vent terminal configuration
drawings in the Vent Termination section above.
Support should be provided for intake piping, particularly so for horizontal runs
(follow local code).
Figure 13: Indoor combustion air intake
MAXIMUM EQUIVALENT LENGTH
200'
200'
allow 5' equivalent
allow 8' equivalent
allow 3' equivalent
use 8' equivalent
160' (max.) actual lineal x 1.2 = equivalent
60' (max.) actual lineal x 3.33 = equivalent
160' (max.) actual lineal x 1.2 = equivalent
INSTALLATION AND OPERATION INSTRUCTIONS