CGi Manual

Part Number 550-142-302/0520
CGi
SERIES 4 — GAS-FIRED WATER BOILER — Boiler Manual
10
Prepare boiler location — air openings
1e
Figure 5 Air from outdoors — horizontal ducts
Figure 4 Air from outdoors — vertical ducts
Figure 2 Air openings to interior spaces
Figure 3 Air directly through outside wall
Air opening options
Two openings — Air supply from inside the building
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1. If the building is of unusually tight construction (see definition, next
page), the building must also be provided with air openings directly
to the outside
, sized and located per Figure 3, Figure 4 or Figure 5.
2. Buildings of typical construction should provide adequate combustion
air from natural infiltration, so additional air openings to the building
are not required.
3. See Figure 2. Provide
two openings through the interior wall, within
12 inches of the ceiling and the floor, sized per Figure 2.
Two openings — Air supply directly from outside
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1. Air openings must be directly through an outside wall, or into a space
that connects directly to the outside (such as a ventilated attic or crawl
space, for example).
2. See Figure 3 —
Openings directly through an outside wall — provide
two openings within 12 inches of the ceiling and the floor, sized per
Figure 3.
3. See Figure 4 —
Air supplied through vertical ducts — provide two
openings
terminated within 12 inches of the ceiling and the floor, sized
per Figure 4.
4. See Figure 5 —
Air supplied through horizontal ducts — provide
two openings within 12 inches of the floor and the ceiling, sized per
Figure 5.
Air openings must be provided
Combustion and ventilation air openings to be in accordance with
the section “Air for Combustion and Ventilation,” of the National
Fuel Gas Code, ANSI Z223.1/NFPA 54 – latest edition, or applicable
provisions of the local building codes.
Provide adequate combustion and ventilation air to
assure proper combustion and reduce the risk of severe
personal injury, death or substantial property damage
caused by flue gas spillage and carbon monoxide
emissions.
Combustion air opening location and sizing
requirements depend on the clearances around
the boiler.
Check the boiler placement compared to
Figure 1a, page 7.
If all clearances are at least equal to Figure 1a,
page 7
, apply the sizing and placement of openings
given on pages 10 and 11.
If ANY clearance is less than Figure 1a, page 7,
you must provide air openings sized and located as
shown in Figure 1b, page 7. DO NOT apply the sizing
and location information shown on page 10 or 11.
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