Vertex GP6, Instruction Manual, Page: 15 / 36

15
VENT PIPE TERMINATION
The first step is to determine where the vent pipe will terminate.
See Figures 15, 20 and 21. The vent may terminate through a
sidewall as shown in Figure 20 or through the roof as shown in
Figure 21.
The vent system must terminate so that proper clearances are
maintained as cited in local codes or the current edition of the
National Fuel Gas Code, ANSI Z223.1, 12.9.1 through 12.9.4.
Instructions on proper installation through a sidewall are provided
in Figure 15.
Plan the vent system layout so that proper clearances are maintained
from plumbing and wiring.
Vent pipes serving power vented appliances are classified by
building codes as "vent connectors". Required clearances
from combustible materials must be provided in accordance
with information in this manual under LOCATING THE NEW
WATER HEATER and INSTALLING THE WATER HEATER,
and with the National Fuel Gas Code and local codes.
PLANNING THE VENT SYSTEM
Plan the route of the vent system from the discharge of the blower
to the planned location of the vent terminal.
1. Layout the total vent system to use a minimum of vent pipe and
elbows.
2. This water heater is capable of venting the flue gases the
equivalent of twenty-five (25) feet of 2 inch pipe, sixty-five (65)
feet of 3 inch pipe, or one-hundred twenty-eight (128) feet of 4
inch pipe as listed in Table 1.
TABLE 1
Number of 2" Maximum 3" Maximum 4" Maximum
90° Elbows Pipe (Feet) Pipe (Feet) Pipe (Feet)
1 20 60 120
2 15 55 112
3 10 50 104
4 -- 45 96
5 -- 40 88
6 -- 35 80
The minimum vent lengths for each of the pipe sizes is one 90° on
top of the unit plus 2' of straight pipe and the appropriate termination.
NOTE: The equivalent feet of pipe listed above are exclusive of
the termination. That is, the termination, with an installed screen,
is assumed to be in the system and the remainder of the system
must not exceed the lengths discussed above.
3. The blower discharge adapter is made to accept only straight
sections of 2" pipe. To start, a minimum of 2 inches of 2" pipe
must be attached to the blower discharge (See figure 17).
If using 2" inch vent pipe:
A minimum of 2 inches must be attached to the blower before
the first elbow. After the first elbow add the additional venting
required for the installation. The total system cannot exceed
the lengths discussed above, where each elbow is equal to 5
feet of straight pipe.
If using 3" or 4" inch vent pipe:
Two inches of pipe must be attached to the blower discharge before
adding a reducer to acquire the desired pipe diameter. An appropriately
sized 45 degree elbow (supplied locally-a schedule 40 DWV) vent
terminal must be obtained with an equivalent screen (supplied in vent
kit). The total system cannot exceed the equivalent pipe lengths
FIGURE 15
WARNING
VENT HOOD(S) MAY BE
EXTREMELY HOT
DURING OPERATION.