Flue gas exhaust to outdoors
Combustion air from boiler room. For indoor air installation, check air intake and boiler room
combustion air opening(s) to ensure they are clear of obstructions.
Figure 21 Indoor combustion air intake
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 (latest edition).
3.5.10 Combustion air filtration system
A built-in combustion air filter system is supplied with the boiler, and is located at the top of the unit. The
boilers use a 10" x 10" x 1" (MERV 8) filter.
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