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3.
Do NOT terminate over public walkways. Avoid areas
where condensate may cause problems such as above
planters, patios, or adjacent to windows where steam may
cause fogging.
4.
The vent termination shall be located at least 4' horizontally
from any electric meter, gas meter, gas regulator, and any
relief equipment. These distances apply ONLY to U.S.
installations.
5.
The vent termination is to be located at least 3' above any
forced air inlet located within 10'; and at least 10' from a
combustion air intake of another appliance, except another
direct vent furnace intake.
6.
In Canada, the Canadian Fuel Gas Code takes precedence
over the preceding termination instructions.
Concentric Vent Termination
Kit # N
AHA001CV & NAHA002CV
For Concentric Vent Termination information call 931.270.4100
with the complete model and serial number of the furnace.
These kits are for vertical or horizontal termination of the
combustion air inlet and the exhaust vent pipes on Category IV
gas--fired condensing furnaces. The NAHA001CV kit can be used
for 3" diameter pipe systems. The NAHA002CV kit can be used
for 2" diameter pipe system. Refer to Table 5 for the correct pipe
size for the furnace. Both the combustion air inlet and the exhaust
vent pipes must attach to the termination kit. The termination kit
must terminate outside the structure and must be installed per the
instructions outlined below for vertical or horizontal termination.
Vertical termination is preferred. Field supplied pipe and fittings
are required to complete the installation.
Figure 31
Kit Components
Kit Contents:
3" Rain Cap or 2" Rain Cap
3" Diameter SDR--26 Pipe, 19
4" Diameter SDR--26 Pipe, 24" Long,
2" Diameter SDR--26 Pipe, 31
1
2
/
" Diameter SDR--26 Pipe, 37
2
3" Y Concentric Fitting or 2" Y Concentric Fitting
2" or 3" Dia.
2 or 2
Y Concentric Fitting
SDR- 26 Pipe
Vertical & Horizontal Termination
1.
Determine the pipe diameters required for the installation
from Table 5 and Figure 33.
2.
Determine the best location for the termination kit. See
Figure 32 for vertical termination or Figure 36 for
horizontal termination. Roof termination is preferred since it
is less susceptible to damage, has reduced intake
contaminants and less visible vent vapor. For side wall
termination, consideration should be given to: 1) possible
damage from the vapors to plants/shrubs, other equipment
and building materials, 2) possible damage to the terminal
from foreign objects, 3) wind effects that may cause
recirculation of flue products, debris or light snow and 4)
visible vent vapor.
440 01 1024 01
1
/
" Long or
2
5
/
" Long or
8
1
/
" Long,
8
Nominal 3" or 4" Dia.
SDR- 26 Pipe
2" or 3" Dia.
Rain Cap
1
/
" Dia.
2
25--22--03
Specifications are subject to change without notice
Concentric Vent Roof Installation
Figure 32
Vent
Combustion
Air
Roof Boot/
Flashing
(Field Supplied)
Vent
Note:
Support must be field installed to secure termination kit to structure.
3.
Cut one 5" diameter hole through the structure for the
NAHA001CV Kit or one 4" diameter
NAHA002CV Kit .
4.
Dimension D may be lengthened to 60" max. or shortened
by cutting the pipes to 12" min. Dimension A will change
according to D dimension. (See Figure 33)
Concentric Vent Dimensional
Figure 33
B PVC
Vent/Exhaust
1
1
/
"
2
B
PVC Intake/Combustion Air
Dimensions
Model
A*
7
NAHA001CV
38
/
8
3
NAHA002CV
33
/
8
* = Dimension will change accordingly as dimension D is
lengthened or shortened.
** = Dimension D may be lengthened to 60" may also be
shortened by cutting the pipes provided in the kit to 12"
minimum
Maintain 12" min. clearance above
highest anticipated snow level. Max.
of 24" above roof.
Support
(Field Supplied)
45° Elbow
(Field Supplied)
Combustion
Air
25--22--02
hole for the
Drawing
C
D
25--22--03
A
B
C
D**
1
1
3
4
/
21
/
2
8
1
5
2
3
/
16
/
2
8
31
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