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Technical Training Department ©2003
Ashland City, Tennessee
SBN TANK TYPE COMMERCIAL GAS WATER HEATER
SERVICE HANDBOOK
Along with adequate make-up air, the quality of the air is important.
Contaminated Air
Contaminants in combustion air can lead to premature heater failure. Vapors from
bleaches, soaps, waxes, salts, etc. are drawn into the combustion chamber with the
make-up air and, once fired, mix with water vapor in the gases to form extremely
corrosive hydrochloric or hydrofluoric acid and other corrosive by-products.
Air for Combustion – Flammable Items
Flammable items, pressurized containers or any other potentially hazardous articles
must never be placed on or adjacent to the heater. Open containers of flammable
material should not be stored or used in the same room with the heater.
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