9
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
ducts
(see Fig. 2)
.
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.
Fig. 2: Ventilation Air From Outdoors
Outlet Air
Outlet Air
Inlet Air
Inlet Air
To
Attic
Ventilated
Crawl Space
To Crawl
Space
Ventilated
Attic
Fig. 1: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.
12 in.
