A.O. Smith ATX-199 Instruction Manual page 18

Fire or Explosion Hazard
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
Avoid all ignition sources if you smell gas.
Do not expose water heater controls to excessive gas
pressure.
Use only the gas shown on the water heater rating label.
Maintain required clearances to combustibles.
Keep ignition sources away from faucets after extended
periods of non-use.
Read instruction manual before
installing, using or servicing
water heater.
VENTILATION REQUIREMENTS
COMBUSTION AIR SUPPLY
WARNING
Breathing carbon monoxide can cause brain damage
or death. Always read and understand the instruction
manual.
National Fuel Gas Code ANSI Z223.1/NFPA 54
(Natural Gas and Propane Installation Code, current
edition)
Check for Chemicals
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Calculate Total BTU/h Rating of All Appliances
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NOTICE:
B149.1
18