Navien CH-180 Installation Manual - page 43
Venting: Outdoor Installation
Contaminated Combustible Air Will Damage the Unit
Outdoor Venting
Venting Clearance
Follow all local codes, or in the absence of local codes, follow the most recent edition of
The National Fuel Gas Code: ANSI Z223.1/NFPA 54 in the USA or CAN/CSA B149.1 Natural
Gas, Propane Installation Code in Canada.
Outdoor installation only for a mild climate.
For Outdoor Venting, Intake air pipe should not be next to Exhaust pipe. That will prevent
exhaust flue gas from entering the intake air pipe. Make sure there are plenty of air around the
intake air pipe and protect any objects from entering the intake air pipe.
When Navien Combination Water Heater / Boiler is installed outdoor, Water Heater / Heating Boiler
installed location should be in open unroofed area with following clearance table below.
Bottom of Heater / boiler
Back of Heater / boiler
Side of Heater / boiler
Front of Heater / boiler
Top of Heater / boiler
43
VENTING