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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 provide 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 Option 3,
Figure 2). Follow the National Fuel
Gas Code, NFPA 54/ANSI Z223.1,
Section 5.3, Air for Combustion and
Ventilation 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 permanent 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
for required size of ventilation grills or
ducts.
IMPORTANT: Do not provide
openings for inlet or outlet air into
attic, if attic has a thermostat-
controlled power vent. Heated air
entering the attic will activate the
power vent.
12”
12"
Ventilation Grills
Into Adjoining Room,
Option 2
Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation
Grills
Into Adjoining
Room,
Option 1
FIGURE 2 - VENTILATION AIR FROM INSIDE BUILDING
TO
CRAWL
SPACE
TO ATTIC
OUTLET AIR
VENTILATED
ATTIC
OUTLET
AIR
INLET
AIR
INLET AIR
VENTILATED
CRAWL SPACE
FIGURE 3 - VENTILATION AIR FROM OUTDOORS
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