Concentric Termination Installation
1.Determine which concentric termination will be installed. (A)HCG3 130T 300 models installed using 4 inch vent/ intake air piping use the 4 inch concentric termination. (A)HCG3 130T 300 models installed using 6 inch vent/intake air piping use the 6 inch concentric termination. (A)HCG3 130T 400 models must use the 6 inch concentric termination on all installations, see Venting Requirements on page 22.
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 28 and Figure 30 on page 29, 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 24
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 35, 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 30 and 31 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 31.
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 28 and Figure 29 on page 29 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
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 28 or 6 Inch Concentric Termination Installation on page 29.
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
CONCENTRIC TERMINATION(S) MUST BE A MINIMUM OF 10 FEET (3 m) AWAY FROM ANY PARAPET, VERTICAL WALL OR STRUCTURE.
6 INCH CONCENTRIC TERMINATION
FLAT ROOF CLEARANCE
Figure 25
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