9
Vent-Free Gas Log Heater User’s Manual
Preparing for Installation (cont.)
If the area in where the heater operates does not meet the required volume for
indoor combustion air, you must provide combustion and ventilation air 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.
WARNING
VENTILATION AIR FROM INSIDE A BUILDING
Fresh air comes from a connected unconfined space.
You must provide two permanent openings when
ventilating to a connected unconfined space, one of
which that’s within 12" of the wall that connects the
two spaces (see options 1 and 2, Fig. 1). You may also
remove the door into the adjoining room (see option 3,
Fig. 1). Follow the National Fuel Gas Code NFPA 54/ANS
Z223.1 for the required size of ventilation grills or ducts.
VENTILATION AIR FROM OUTDOORS
Extra fresh air is provided via ventilation grills or
ducts. You must provide two permanent openings:
one within 12" of the ceiling and one within 12" of
the floo
r
. They must connect directly to the outdoors
or spaces that open to the outdoors. Such spaces
may include attics or crawl spaces. Follow the
National Fuel Gas Code NFPA 54/ANS Z223.1 for the
required size of ventilation grills or ducts.
IMPORTANT:
Do not provide openings for inlet or
outlet air into an attic if the attic has a thermostat-
controlled power vent. The power vent will be
activated by heated air that enters the attic. You must
add the space of the connected unconfined space
and rework the information on page 8. The combined
spaces must have enough fresh air to supply all
appliances in both spaces.
12 in.
Ventilation Grills
Into adjoining Room
Option 2
Or
Remove
Door
Into
Adjoining
Room
Option 3
Ventilation
Grills
Into Adjoining
Room
Option 1
To
Attic
To
Crawl
Space
Outlet
Air
Ventilated
Crawl Space
Ventilated
Attic
Inlet Air
Inlet
Air
Outlet
Air
12 in.
Ventilation Grills
Into adjoining Room
Option 2
Or
Remove
Door
Into
Adjoining
Room
Option 3
Ventilation
Grills
Into Adjoining
Room
Option 1
To
Attic
To
Crawl
Space
Outlet
Air
Ventilated
Crawl Space
Ventilated
Attic
Inlet Air
Inlet
Air
Outlet
Air
Fig. 1—Ventilation Air from Inside a Building
Fig. 2—Ventilation Air from Outdoors
