5. Concentric Termination
Vent Termination Clearances
CARBON MONOXIDE POISONING, FIRE AND
EXPLOSION HAZARD
Failure to properly vent this furnace could result in
death, personal injury and/or property damage.
Inlet and outlet pipes may NOT be vented directly
above each other (standard vent terminals).
1. Determine termination locations based on clearances spe-
cified in following steps and as shown in Figure 8,
Figure 30 through Figure 35.
2. The vent termination must be located at least 12" above
ground or normally expected snow accumulation levels.
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 FuelGas Codetakes precedence
over the preceding termination instructions.
Concentric Vent Termination - Kit #
NAHA001CV & NAHA002CV
These kits are for vertical or horizontal termination of the combus-
tion air inlet and the exhaust vent pipes on Category [V gas-fired
condensing furnaces. The NAHA001CV kit can be used for 3" di-
ameter pipe systems. The NAHA002CV kit can be used for 2" di-
ameter pipe system. Refer to Table 5 or Table 6 for the correct
pipe size for the furnace. Both the combustion air inlet and the ex-
haust 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 termina-
tion. Vertical termination is preferred. Field supplied pipe and fit-
tings are required to complete the installation.
Kit Components
KitContents:
3" Rain Cap or 2" RainCap
3 Diameter SDR-26 Pipe, 19 /2 Long or
. 1 .
4 Diameter SDR-26 Pipe, 37 /8 Long,
t_ 5 i_
2 Diameter SDR-26 Pipe, 31 /8 Long or
21/2"Diameter SDR-26 Pipe,24" Long,
3" Y Concentric Fittingor 2" Y Concentric Fitting
Nominal3" or4"Dia.
,/. SDR-26Pipe
AlL
• 2 or 2112" Dia.
YConcentricFitting SDR-26Pipe
2" or 3" Dia.
Rain Cap
25-22-03
Vertical & Horizontal Termination
1,
2.
Determine the pipe diameters required for the installation
from Table 5 or Table 6 and Figure 32.
Determine the best location for the termination kit. See
Figure 31 for vertical termination or Figure 35 for horizon-
tal 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, con-
sideration should be given to: 1) possible damage from the
vapors to plants/shrubs, other equipment and building ma-
terials, 2) possible damage to the terminal from foreign ob-
jects, 3) wind effects that may cause recirculation of flue
products, debris or light snow and 4) visible vent vapor•
Concentric Vent Roof Installation
Vent
Combustion
R°°f2i'r°"
Flashing _.. r
(FieldSupplied)
Vent _ i
Maintain12"min.clearanceabove
highestanticipatedsnowlevel.Max.
_24" aboveroof.
(FieldSupplied)
45° Elbow
Combustion
Note: 25-22-02
Support must be field installed to secure termination kit to structure•
3. Cut one 5" diameter hole through the structure for the
NAHAOOICV Kit or one 4" diameter hole for the
NAHAOO2CV Kit.
4. Dimension D may be lengthened to 60" max. or shortened
by cutting the pipes to 12" min. Dimension A will change ac-
cording to D dimension. (See Figure 32)
[_ 44001 102102
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