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less than 100 square inches (645 cm²).
If the confined space is within a building of tight construction, air for combustion
and ventilation must be obtained from outdoors. When directly communicating
with the outdoors through vertical ducts, two permanent openings, located
in the above manner, shall be provided. Each opening shall have a free area
of not less than one square inch (6.5 cm²) per 4000 Btuh of the total input of
all appliances in the enclosure. If horizontal ducts are used, each opening
shall have a free area of not less than one square inch (6.5 cm²) per
2000 Btuh of the total input of all appliances in the enclosure.
CHEMICAL VAPOR CORROSION
WARNING
CORROSION OF THE FLUE WAYS AND VENT SYSTEM MAY OCCUR IF
AIR FOR COMBUSTION CONTAINS CERTAIN CHEMICAL VAPORS. SUCH
CORROSION MAY RESULT IN FAILURE AND RISK OF ASPHYXIATION.
Spray can propellants, cleaning solvents, refrigerator and air conditioning
refrigerants, swimming pool chemicals, calcium and sodium chloride, waxes,
and process chemicals are typical compounds which are potentially
corrosive.
PRODUCTS OF THIS SORT SHOULD NOT BE STORED NEAR THE HEATER.
ALSO, AIR WHICH IS BROUGHT IN CONTACT WITH THE HEATER
SHOULD NOT CONTAIN ANY OF THESE CHEMICALS. IF NECESSARY,
UNCONTAMINATED AIR SHOULD BE OBTAINED FROM REMOTE OR
OUTSIDE SOURCES.
VENTING
WARNING
THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST BE
FOLLOWED TO AVOID CHOKED COMBUSTION OR RECIRCULATION OF
FLUE GASES. SUCH CONDITIONS CAUSE SOOTING OR RISKS OF FIRE
AND ASPHYXIATION.
Heater must be protected from freezing downdrafts during shutdown periods.
WARNING
NEVER OPERATE THE HEATER UNLESS IT IS VENTED TO THE OUTDOORS
AND HAS ADEQUATE AIR SUPPLY TO AVOID RISKS OF IMPROPER
OPERATION, FIRE, EXPLOSION OR ASPHYXIATION.
VENT PIPE TERMINATION
NOTE: Before installing venting, determine place of vent pipe termination.
See Figure 6 before proceeding.
CAUTION
DO NOT TERMINATE THE VENTING WHERE NOISE FROM THE EXHAUST
OR INTAKE WILL BE OBJECTIONABLE. THIS INCLUDES LOCATIONS
CLOSE TO OR ACROSS FROM WINDOWS AND DOORS. AVOID
ANCHORING THE VENT AND INTAKE PIPES DIRECTLY TO FRAMED
WALLS, FLOORS OR CEILINGS UNLESS RUBBER ISOLATION PIPE
HANGERS ARE USED. THIS PREVENTS ANY VIBRATIONS FROM BEING
ALCOVE
HARD WATER
Where hard water conditions exist, water softening or the threshold type
of water treatment is recommended. This will protect the dishwashers,
coffee urns, water heaters, water piping and other equipment.
See MAINTENANCE section for details of tank cleanout procedure.
AIR REQUIREMENTS
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE
MATERIALS, GASOLINE AND OTHER FLAMMABLE VAPORS AND
LIQUIDS.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILATING
AIR.
WARNING
FOR SAFE OPERATION PROVIDE ADEQUATE AIR FOR COMBUSTION
AND VENTILATION. AN INSUFFICIENT SUPPLY OF AIR WILL CAUSE
RECIRCULATION OF COMBUSTION PRODUCTS RESULTING IN
CONTAMINATION THAT MAY BE HAZARDOUS TO LIFE. SUCH A
CONDITION OFTEN WILL RESULT IN A YELLOW, LUMINOUS BURNER
FLAME, CAUSING CARBONING OR SOOTING OF THE COMBUSTION
CHAMBER, BURNERS AND FLUE TUBES AND CREATES A RISK OF
ASPHYXIATION.
MECHANICAL EXHAUSTING OF ROOM AIR
Where an exhaust fan is installed in the same room with a heater, sufficient
openings for air must be provided in the walls. UNDERSIZED OPENINGS
WILL CAUSE AIR TO BE DRAWN INTO THE ROOM THROUGH THE
HEATER’S VENTING SYSTEM, CAUSING POOR COMBUSTION. SOOTING
MAY RESULT IN SERIOUS DAMAGE TO THE HEATER AND RISK OF FIRE
OR EXPLOSION. IT CAN ALSO CREATE A RISK OF ASPHYXIATION.
UNCONFINED SPACE
In buildings of conventional frame, brick or stone construction, unconfined
spaces may provide adequate air for combustion and ventilation.
If the unconfined space is within a building of tight construction (buildings
using the following construction: weather stripping, heavy insulation,
caulking, vapor barrier, etc.), air for combustion and ventilation must be
obtained from outdoors. The installation instructions for confined spaces
in tightly constructed buildings must be followed to ensure adequate air
supply.
CONFINED SPACE
When drawing combustion air from inside a conventionally constructed
building to a confined space, such a space shall be provided with two
permanent openings, ONE IN OR WITHIN 12 INCHES (31 cm) OF THE
ENCLOSURE TOP AND ONE IN OR WITHIN 12 INCHES (31 cm) OF THE
ENCLOSURE BOTTOM. Each opening shall have a free area of at least one
square inch (6.5 cm²) per 1000 Btuh appliances in the enclosure, but not