Navien KDB-535GTD Installation Manual page 20

M e d i u m - s i z e d g a s b o i l e r
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Installation of the chimney pipe for the forced exhaust type (FE) boiler
■ The exhaust duct type of the forced exhaust type (FE) boiler: the single exhaust type, the
chamber type, the shared exhaust type
■ The total length of the exhaust duct shall be kept to 10m or less, and the curved parts to 3
segments or less. (except for the curve on the edge point of the exhaust duct)
■ The connection size of the exhaust duct shall comply with the specifications. (Refer to the
specifications.)
■ Care shall be taken to prevent the middle part of the exhaust duct from getting narrower. The
exhaust duct shall be installed to keep the radius of the curved part at maximum as possible.
■ The exhaust duct shall be heat insulated with the non-flammable insulation material.
The horizontal section of the chimney pipe shall
be installed to be inclined downward at an angle
of 5°, to prevent the condensed water or rain
from flowing in reverse into the boiler.
Flow of the condensed water or rain into the
boiler may deteriorate the performance of the
boiler and shorten the life of the boiler.
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