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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 3). 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. You can also remove door into adjoining room (see option 3, Figure 3).
Outlet
Air
Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air
Ventilated
Crawl Space
To
Crawl
Space
To Attic
Figure 4 - Ventilation Air from Outdoors
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.
Figure 3 - Ventilation Air from Inside Building
WARNING ICON G 001
WARNING
Re-calculate 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.
Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option 2
Ventilation
Grills
Into Adjoining
Room,
Option 1
12"
12"