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AIR FOR
COMBUSTION AND
VENTILATION
Continued
VENTILATION AIR
Ventilation Air From Inside
Building
This fresh air would come from an adjoining
unconfined space. When ventilating to an
adjoining unconfined space, you must pro-
vide two permanent openings: one within
12" of the ceiling and one within 12" of the
floor on the wall connecting the two spaces
(see options 1 and 2, Figure 2). You can also
remove door into adjoining room (see op-
tion 3, Figure 2). Follow the National Fuel
Gas Code NFPA 54/ANSI Z223.1, Section
5.3, Air for Combustion and Ventilation or
Canadian Gas Code B-149.1 and 2-M95,
Section 7.2 and 7.3 and/or applicable local
codes for required size of ventilation grills
or ducts.
WARNING: Rework work-
sheet, adding the space of the
adjoining unconfined space. The
combined spaces must have
enough fresh air to supply all
appliances in both spaces.
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation
grills or ducts. You must provide two per-
manent openings: one within 12" of the
ceiling and one within 12" of the floor.
Connect these items directly to the outdoors
or spaces open to the outdoors. These spaces
include attics and crawl spaces. Follow the
National Fuel Gas Code NFPA 54/ANSI
Z223.1, Section 5.3, Air for Combustion and
Ventilation or Canadian Gas Code B-149.1
and 2-M95, Section 7.2 and 7.3 and/or appli-
cable local codes for required size of venti-
lation grills or ducts.
105056
Ventilation
Grills
Or
into Adjoining
Remove
Room,
Door into
Option 1
Adjoining
Room,
Option 3
Figure 2 - Ventilation Air From Inside Building If Applicable
Inlet
Air
Figure 3 - Ventilation Air From Outdoors
5
OWNER'S MANUAL
12"
Ventilation Grills
Into Adjoining Room,
Option 2
12"
Outlet
Air
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