Navien NCB700-42C Installation & Operation Manual page 21

Adequate installation clearances
CAUTION
Do not install the boiler on carpeting.
Install the boiler in an area that allows for service and
maintenance access to utility connections, piping, filters,
and traps. Based on the installation location, ensure that the
following clearances are maintained:
Sides
20 Installing the Boiler
Top
Sides
Front
Bottom
Clearance from: Indoor Installation
Top 250 mm minimum
Front 600 mm minimum
Bottom 200 mm minimum
Sides 5 mm minimum
Clean, debris and chemical-free combustion air
Do not install the boiler in areas where dust and debris may
●
accumulate or where hair sprays, spray detergents, chlorine,
or similar chemicals are used.
Do not install the boiler in areas where petrol or other
●
flammables are used or stored.
Ensure that combustible materials are stored away from
●
the boiler and that hanging laundry or similar items do not
obstruct access to the boiler or its flue system.