Navien CH-180 Installation Manual page 44

Read all safety warnings in the "User's Operation Manual". The
additional safety issues outlined below must also be followed
completely when installing this Navien Combination Water Heater /
Heating Boiler:
Follow all local codes and/or the most recent edition of the National Fuel Gas
Code (ANSI Z223.1/NFPA 54) in the USA or the Natural Gas and Propane
Installation Code in Canada (CAN/CSA B149.1).
Vent terminal should not be pointing toward any opening of the building or
windows. Do not install the Water Heater / Heating Boiler in crevices to pre-
vent gas from accumulating.
Prevent debris, liquid or flammable gas from entering the Combination
Water Heater / Heating Boiler intake air pipe terminal. It may cause damage
to the Combination Water Heater / Heating Boiler and warranty will be
avoided.
Install the Combination Water Heater / Heating Boiler outdoor under the
overhang with 3 feet or more from the eaves to the top of the Combination
Water Heater / Heating Boiler vent terminal. Water Heater / Heating Boiler
must have open space around all 3 sides.
Water Heater / Heating Boiler vent terminal should be 4ft(united state)/
3ft(Canada) or more from windows and doors.
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