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INSTALLATION
SL 26-260 G3, SL 40-399 G3 MODULATING GAS BOILERS
To support combustion, an ample air supply is required. This may require direct openings
in the boiler room to the outside. If the boiler is not in a room adjacent to an outside wall,
air may be ducted from outside wall openings.
Provisions for combustion and ventilation air must be made as follows:
• in the USA, in accordance with the National Fuel Gas Code, ANSI Z223.1 (latest
edition), or applicable provisions of the local building codes
• in Canada, in compliance with B149.1
1.4.9 Combustion Air Filtration
If combustion air contamination from ingested particulate matter is a concern in any
installation, an optional air intake lter may be installed.
IMPORTANT: Under no circumstances should a third-party air lter be installed on
an IBC boiler without proper evaluation and written approval of the IBC Engineering
Department.
Figure 21: Combustion air intake
1.4.10 Closet Installations
For installations in a conned 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).
Figure 20: Air Intake Filter
Assembly P-172
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