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AIR FOR COMBUSTION AND VENTILATION
CONTINUED
B. Vent room directly to the outdoors. See
Ventilation Air from Outdoors
, page 10.
C. Install a lower BTU/Hr firebox, if lower BTU/Hr size makes room unconfined.
If the actual BTU/Hr used is less than the maximum BTU/Hr the space can support, the space
is an unconfined space. You will need no additional fresh air ventilation.
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ARNINGARNING
ARNINGARNING
ARNING
If the area in which the heater may be operated is smaller than that defined as anIf the area in which the heater may be operated is smaller than that defined as an
If the area in which the heater may be operated is smaller than that defined as anIf the area in which the heater may be operated is smaller than that defined as an
If the area in which the heater may be operated is smaller than that defined as an
unconfined space or if the building is of unusually tight construction, provide ad-unconfined space or if the building is of unusually tight construction, provide ad-
unconfined space or if the building is of unusually tight construction, provide ad-unconfined space or if the building is of unusually tight construction, provide ad-
unconfined space or if the building is of unusually tight construction, provide ad-
equate combustion and ventilation air by one of the methods described in the Na-equate combustion and ventilation air by one of the methods described in the Na-
equate combustion and ventilation air by one of the methods described in the Na-equate combustion and ventilation air by one of the methods described in the Na-
equate combustion and ventilation air by one of the methods described in the Na-
tional Fuel Gas Codetional Fuel Gas Code
tional Fuel Gas Codetional Fuel Gas Code
tional Fuel Gas Code
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,,
,
ANSI Z223.1, ANSI Z223.1,
ANSI Z223.1, ANSI Z223.1,
ANSI Z223.1,
Section 5.3 or applicab Section 5.3 or applicab
Section 5.3 or applicab Section 5.3 or applicab
Section 5.3 or applicab
le local codes.le local codes.
le local codes.le local codes.
le local codes.
VENTILAVENTILA
VENTILAVENTILA
VENTILA
TION AIRTION AIR
TION AIRTION AIR
TION AIR
VV
VV
V
entilation Air Frentilation Air Fr
entilation Air Frentilation Air Fr
entilation Air Fr
om Inside Buildingom Inside Building
om Inside Buildingom Inside Building
om Inside Building
This fresh air would come from an adjoining unconfined space. When ventilating to an ad-
joining unconfined space, you must provide two permanent openings: one within 12" of the
ceiling and one within 12" of the floor into adjoining room (
see options in Figure 1)
.
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.
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ARNINGARNING
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Rework worksheet, adding the space of the adjoining unconfined space. TheRework worksheet, adding the space of the adjoining unconfined space. The
Rework worksheet, adding the space of the adjoining unconfined space. TheRework worksheet, adding the space of the adjoining unconfined space. The
Rework worksheet, adding the space of the adjoining unconfined space. The
combined spaces must have enough fresh air to supply all appliances in bothcombined spaces must have enough fresh air to supply all appliances in both
combined spaces must have enough fresh air to supply all appliances in bothcombined spaces must have enough fresh air to supply all appliances in both
combined spaces must have enough fresh air to supply all appliances in both
spaces.spaces.
spaces.spaces.
spaces.
Figure 1 - Figure 1 -
Figure 1 - Figure 1 -
Figure 1 -
VV
VV
V
entilation Air frentilation Air fr
entilation Air frentilation Air fr
entilation Air fr
om Inside Buildingom Inside Building
om Inside Buildingom Inside Building
om Inside Building
VENTILATION GRILLS INTO
ADJOINING ROOM.
OPTION 2OPTION 2
OPTION 2OPTION 2
OPTION 2
VENTILATION GRILLS
INTO ADJOINING
ROOM.
OPTION 1OPTION 1
OPTION 1OPTION 1
OPTION 1
OR REMOVE DOOR INTO
ADJOINING ROOM.
OPTION 3OPTION 3
OPTION 3OPTION 3
OPTION 3
9