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WARNING:
Combustible construction refers to adjacent walls and ceilings and should not be confused
with combustible or flammable products and materials. Combustible and or flammable products and materials
should never be stored in the vicinity of this or any gas appliance.
Combustion and Ventilation Air
A confined space is one having a volume of less than 50 cubic feet per 1,000 BTU/Hr of the aggregate input of
all appliances within that space.
The air must be supplied through two permanent openings of equal area. One is to be located within 12”
above the floor and the other is to be located within 12” below the ceiling.
The minimum net free area of each opening must not be less than one square inch per 1,000 BTU/Hr of the
total input rating of all the appliances in the enclosure (but not less than 100 square inches), if each opening
communicates with other unconfined areas inside the building.
Buildings of unusually tight construction shall have the combustion and ventilation air supplied from outdoors,
or a freely ventilated attic or crawl space.
If air is supplied from outdoors, directly or through vertical ducts, there must be two openings located as
specified above and each must have a minimum net free area of not less than one square inch per 4,000
BTU/Hr of the total input rating of all the appliances in the enclosure.
If horizontal ducts are used to communicate with the outdoors, each opening must have a minimum net free
area of not less than one square inch per 2,000 BTU/Hr of the total input rating of all the appliances in the
enclosure. If ducts are used, the minimum dimensions of rectangular air ducts shall not be less than 4”.
NOTICE:
If the water heater is installed in an unconfined space within a building of conventional frame,
masonry or metal construction, infiltration air is normally adequate for proper combustion and ventilation. If
the water heater is installed in a confined space, provisions for combustion and ventilation air must be made.
NOTICE:
If the duct openings which supply combustion and ventilation air are to be covered with a protective
screen or grill, the net free area (openings in the material) of the covering material must be used in determin-
ing the size of the openings. Protective screening for the openings MUST NOT be smaller than 1/4” to prevent
clogging by lint or other debris.
Corrosive Atmospheres
The air in beauty shops, dry cleaning establishments, photo processing labs, and storage areas for liquid and
powdered bleaches or swimming pool chemicals often contain such
An air supply containing halogenated hydrocarbons may be safe to breathe, but when it passes through a gas
flame corrosive elements are released that will shorten the life of any gas burning halogenated hydrocarbons
appliance.
Propellants from common spray cans or gas leaks from A/ C and refrigeration equipment are highly corrosive
after passing through a flame.
The water heater warranty is voided when failure of the water heater is due to operation in a corrosive atmo-
sphere.
NOTICE:
The water heater should not be installed near an any air supply containing halogenated
hydrocarbons.
Visit Us: Camplux.com
3330-A Marathon Ct Charleston, SC 29418
(844) 538-7475
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