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Installations require both a vent/flue pipe and a
combustion air intake pipe. Refer to the
appropriate section for details concerning piping
size, length, number
of
elbows, furnace
connections, and terminations.
DIRECT VENT (DUAL PIPE) PIPING -
BECKETT NX
NON-DIRECT VENT (DUAL PIPE)
INTERburner
Installations require both a combustion air intake
and a ventlflue pipe. The pipes may be run
horizontally and exit through the side
of
the
building or run vertically and exit through the
roof
of
the building.
The pipes may be run through an existing
unused chimney; however, they must extend a
minimum
of
12 inches above the top
of
the
chimney.
The space between the pipes and the chimney
must be closed with a weather tight, corrosion
resistant flashing. Both the combustion air
intake and vent/fJue pipe terminations must
be
in
the
same
atmospheric pressure zone.
Refer
to
Section
VI, Vent/flue and Combustion
air
Pipe - Termination Locations or Concentric
Vent Termination for specific details on
termination construction.
For details concerning connection
of
pipes to the
furnace, refer to the Section VI, Vent/Flue Pipe
and Combustion Pipe - Standard Furnace
connections or alternate furnace connections.
ROOF VENT SYSTEM
The vent termination
of
vent pipe run vertically
through a roof must terminate at least 12 inches
above the roof line (or the anticipated snow
level) and be
at
least 12 inches from any vertical
wall (inclUding any anticipated snow build up).
Vertical
Tenninations
(Dual Pipe)
Horizontal terminations should be as shown in
the following figure. Refer to Section VI,
Vent/Flue Pipe and Combustion
Pipe-
Termination Location for location restrictions.
A 3
~
inch diameter hole is required for
3"
diameter pipe. To secure the pipe passing
through the wall and prohibit damage to piping
connections, a coupling should be installed on
either side
of
the wall and solvent cemented to a
pipe connecting the two couplings.
The pipe length should be the wall thickness
plus the depth
of
the socket fittings to be
installed on the inside and outside
of
the wall.
The wall penetration should be sealed with
silicone caulking material.
Standard
horizontal
Terminations
(Dual Pipe)
Alternate
Horizontal
Vent
Tennination
(Dual
Pipe)
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