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22
© 2020 United States Stove Company
AIR FOR COMBUSTION AND
VENTILATION INSIDE BUILDING
This fresh air would come from an adjoining
unconned space. When venting to an adjoining
space, you must provide two permanent openings:
one within 12” of the ceiling and one within 12” of
the oor, on the wall connecting two spaces (see
Options 1 and 2 below). You can also remove the
door into the adjoining room as shown.
WARNING:
REWORK WORKSHEET, ADDING SPACE OF
ADJOINING UNCONFINED SPACE. COMBINED
SPACES MUST HAVE ADEQUATE AMOUNT OF
AIR TO SUPPLY ALL APPLIANCES IN BOTH
SPACES
NOTE: Each opening shall have a minimum free
area of 1 square inch per 1000 BTU’s per hour of the
total input ratings of all gas utilization equipment
in the conned space, but not less than 100 square
inches.
Ventilation Air From Inside Building
HOT AIR REGISTERS INTO
ADJOINING ROOMS
OPTION 2
HOT AIR REGISTERS INTO
ADJOINING ROOMS
OPTION 1
REMOVE DOOR
INTO ADJOINING
ROOM
OPTION 3
12”
12”
WARNING:
THIS HEATER MUST HAVE ADEQUATE AMOUNT
OF AIR FOR PROPER OPERATION. IF NOT,
POOR FUEL COMBUSTION COULD RESULT.
READ THE FOLLOWING INSTRUCTIONS TO
ENSURE PROPER AMOUNT OF AIR FOR THIS
AND OTHER FUEL-BURNING APPLIANCES IN
YOUR HOME.
AIR FOR COMBUSTION AND
VENTILATION OUTDOORS
Provide extra fresh air by using ventilation grills or
ducts. You must provide two permanent openings:
one within 12” of the ceiling and one within 12” of the
oor. Connect these items directly to the outdoors.
These spaces include attics and crawl spaces. Follow
the National Fuel Gas Code NFPA 54/ ANSI Z223.1,
Section 5.3, “Air For Combustion and Ventilation”
for the required size of ventilation grills or ducts.
IMPORTANT: Do not provide openings for inlet air
into attic if the attic has a thermostat-controlled
power vent. Heated air entering the attic will
activate the power unit.
Ventilated Attic
Outlet Air
Inlet Air
Ventilated
Crawl Space
To
Crawl
Space
To Attic
Outlet Air
Inlet Air
Ventilation Air From Outdoors
VENTILATION
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