John Wood Commercial - 300-400K BTU - Manual (Page 26)

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termination. use only Schedule 40 PVC to extend the 6 inch
concentric termination.
When shortening the length of the termination carefully
measure and cut the larger (intake air) pipe first. Cut the
same amount of pipe off of the smaller (vent) pipe.
10. Depending on which termination(s) is being installed go to 4
Inch Concentric Termination Installation on page 27 or 6 Inch
Concentric Termination Installation on page 28.
CONCENTRIC TERMINATION(S)
MUST BE A MINIMUM OF 10 FEET
(3 m) AWAY FROM ANY PARAPET,
VERTICAL WALL OR
STRUCTURE.
4 INCH CONCENTRIC TERMINATION
FLAT ROOF CLEARANCE
figure 24
6 INCH CONCENTRIC TERMINATION
FLAT ROOF CLEARANCE
CONCENTRIC TERMINATION(S)
MUST BE A MINIMUM OF 10 FEET
(3 m) AWAY FROM ANY PARAPET,
VERTICAL WALL OR
STRUCTURE.
figure 25
concentric termination installation
1. Determine which concentric termination will be installed.
AJWSH130300 models installed using 4 inch vent/
intake air piping use the 4 inch concentric termination.
AJWSH130300 models installed using 6 inch vent/intake air
piping use the 6 inch concentric termination. AJWSH130400
models must use the 6 inch concentric termination on all
installations, see Venting requirements on page 21.
2. Determine the location for the termination.
note:
roof termination is preferred since it is less susceptible
to damage, has reduced chances to intake contaminants and
vent vapors are less visible.
3. When installing a concentric termination vertically through the
roof; ensure that all exterior vertical clearance requirements
for the concentric termination, shown in Figure 27 on page
27 and Figure 30 on page 28, are being maintained. These
clearances and those cited by local and national codes must
be maintained.
4. When installing a concentric termination vertically through a
flat roof, the termination's vent cap must be a minimum of 10
feet (3 m) away from any parapet, vertical wall or structure as
shown in Figure 24 and Figure 25.
note:
If this required distance to a parapet, vertical wall or
structure cannot be maintained, standard terminations must
be used. See Vertical Termination Installation on page 23
5. When installing a concentric termination through a sidewall;
ensure that all exterior sidewall clearance requirements for
the termination, shown in Figure 49 on page 34, are being
maintained. These clearances and those cited by local and
national codes must be maintained.
6. When installing multiple concentric terminations vertically
through a roof or horizontally through a sidewall ensure the
required clearances between terminations and groupings of
multiple terminations are maintained. See pages 29 and 30 for
more information.
7. Cut a 5 inch (13 cm) diameter hole for 4 inch concentric
terminations or 7 inch (18 cm) diameter hole for 6 inch
concentric terminations where the they will pass through the
wall or roof.
note:
beware of concealed wiring and piping when cutting
through the wall or roof.
8. When installing multiple concentric terminations vertically
through the roof in the same location the termination caps
for all concentric terminations must be at the same height
measured from ground. See Multiple Concentric Termination
Arrangements on page 30.
9. Determine if the concentric termination will need to be
shortened or lengthened to accommodate required
clearances or to ensure all vent caps are at the same height
when installing multiple terminations vertically through the
roof in the same location.
See Figure 26 on page 27 and Figure 29 on page 28 for the
maximum and minimum lengths allowed for the 4 inch and 6
inch concentric terminations.
When extending the length of a concentric termination
do not
use couplings. The use of couplings will restrict
flow through the termination and may cause improper
combustion. The termination’s intake air and vent pipes must
be replaced with longer sections of the same pipe material
when extending the length of the termination.
use only SDr-26 pipe to extend the 4 inch concentric