9
Ventilation Air From Inside
Building
Ventilation Grills Into
Adjoining Room
Option 2
Ventilation
Grills Into
Adjoining
Room
Option 1
Or
Remove
Door Into
Adjoining
Room
Option 3
12 in
Ventilation Air
from Outdoors
Outlet
Air
Outlet
AIr
Inlet
Air
Inlet
Air
Ventilated
Crawl Space
To
Attic
To
Crawl
Space
Ventilated
Attic
PREPARING FOR INSTALLATION
Ventilation Air From Inside Building
This fresh air would come from adjoining
unconfined space. When ventilating to an
adjoining unconfined space, you must
provide two permanent openings: one
within 12 in. of the wall connecting
the two spaces (see options 1 and 2,
Fig. 1). You can also remove door into
adjoining room (see option 3, Fig. 1).
Follow the National Fuel Gas Code
NFPA 54/ANS Z223.1. Air for Combustion
and Ventilation for required size of
ventilation grills or ducts.
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation
grills or duct. You must provide two
permanent openings: one within 12 in. of
the ceiling and one within 12 in. 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/ANS Z223.1. 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. 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.
WARNING:
If the area in which the heater may be operated does not meet the re-
quired volume for indoor combustion air, combustion and ventilation air shall be
provided by one of the methods described in the NATIONAL FUEL GAS CODE, ANSI
Z223.1/NFPA 54, the INTERNATIONAL FUEL GAS CODE, or applicable local codes.
Fig. 1
Fig. 2
