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103873
FRESH AIR
FOR
COMBUSTION
AND
VENTILATION
Continued
WARNING ICON G 001
WARNING
If the area in which the heater may be operated is smaller than that
defined as an unconfined space, provide adequate combustion and
ventilation air by one of the methods described in the
National Fuel
Gas Code, ANSI Z223.1, 1992, Section 5.3
or applicable 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 NFPA 54/ANSI
Z223.1, Section 5.3, Air for Combustion and Ventilation for required size of ventila-
tion grills or ducts.
WARNING ICON G 001
WARNING
Rework worksheet, adding the space of the adjoining unconfined
space.
The combined spaces must have enough fresh air to supply all
appliances in both spaces.
Figure 2 - Ventilation Air from Inside Building
Continued
Or
Remove
Door into
Adjoining
Room,
Option 3
Ventilation Grills
Into Adjoining Room,
Option 2
12"
12"
Ventilation
Grills
into Adjoining
Room,
Option 1