Rinnai RH180 Installation Fundamentals page 22

Vent Guidelines: Combustion air
Combustion air is drawn from the room in which the water heater is installed. This water heater
requires adequate combustion air for ventilation and dilution of flue gasses. Failure to provide
adequate combustion air can result in unit failure, fire, explosion, serious bodily injury or death.
Read all the venting guidelines in the Operation and Installation manual.
Note: Combustion air must be free of corrosive chemicals. Do
not provide combustion air from corrosive environments.
Appliance failure due to corrosive air is not covered by the
warranty.
• Combustion air must be free of acid forming chemicals such
as sulfur, fluorine and chlorine. These chemicals have been
found to cause rapid damage/decay and could become toxic
when drawn into the combustion chamber of the appliance.
• Such chemicals can be found in, but not limited to bleach,
ammonia, cat litter, aerosol sprays, cleaning solvents,
varnish, paint, and air fresheners.
• Do not store any of the products listed above in the vicinity of
this water heater.
The room in which the water heater is installed must be defined
as a confined or unconfined space based on the code
requirements pertaining to Category 1 type appliances.
22
Air from the
space is used
for
combustion