IBC HC Series Installation And Operating Instructions Manual page 21

HC SERIES BOILERS HC 13-50, HC 23-84, HC 29-106, HC 20-125, HC 33-160
For the inlet air – Schedule 40 PVC, CPVC, ABS or PPs piping of any type is
permitted. Use same diameter as Vent pipe.
Combustion air piping 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. Bird screen of 1/4" stainless steel or plastic mesh (eg. IPEX System
636 drain grate for CPVC systems) is useful to guard against foreign objects.
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).
1.4.8 "Indoor Air" Combustion Air Intake
Using Indoor Combustion Air is not approved for use with the HC series boilers.
1.4.10 Closet Installations
For installations in a confined space (such as a closet), ventilation openings may
be needed through a door or wall to prevent excessive heat from building up
inside the space.
The boiler shall not be exposed to ambient conditions above 122°F (50°C) or
below 32°F (0°C).
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INSTALLATION