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Figure 3 - Ventilation Air from Outdoors
Outlet
Air
Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air
Ventilated
Crawl Space
To
Crawl
Space
To Attic
AIR FOR COMBUSTION AND VENTILATION
Continued
Ventilation Air From Outdoors
Provide. extra. fresh. air. by. using. ventilation.
grills or ducts. You must provide two perma-
nent 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, ANSI Z223.1/NFPA 54, 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.thermo-
stat-controlled power vent. Heated air entering
the attic will activate the power vent.
WARNING: If the area in
which the heater may be oper-
ated is smaller than that defined
as an unconfined space or if the
building is of unusually tight
construction, provide adequate
combustion and ventilation air
by one of the methods described
in the
National Fuel Gas Code,
ANSI Z223.1/NFPA 54
or appli-
cable local codes.
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, ANSI
Z223.1/NFPA 54, Air for Combustion and
Ventilation
for required size of ventilation
grills.or.ducts.
Figure 2 - Ventilation Air from Inside
Building
Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option 2
Ventilation
Grills
Into Adjoining
Room,
Option 1
12"
12"