INSTALLATION CONSIDERATIONS
24
exit through the roof of the building. The pipes may be run
through an existing
unused
chimney; however, they must
extend a minimum of 12 inches above the top of the chim-
ney. The space between the pipes and the chimney must
be closed with a weather tight, corrosion resistant flashing.
Both the combustion air intake and a vent/flue pipe termina-
tions must be in the same atmospheric pressure zone. Re-
fer to
Vent/Flue and Combustion Air Pipe - Termination Lo-
cations or Concentric Vent Termination
section in this manual
or the installation instructions for specific details on termi-
nation construction.
Concentric Vent Kits (DCVK) Application
The DCVK-20 and DCVK-30 kit is designed to allow the
terminations of a direct vent furnace to be “concentrically”
vented through a wall or roof. This kit allows a single pen-
etration to support terminations for both the vent/flue pipe
and the combustion air intake pipe.
(DCVK) Vent Termination Clearances
1.
Determine termination locations based on clearances
specified in furnace installation instructions, and following
steps as shown in Figures 1,3,6,7,8 and 9.
D ir e c t V e n t
T e r m in a l
5 0 ,0 0 0 B t u h
o r le s s
9 "
1 2 "
1 2 "
1 2 "
D ir e c t V e n t T e r m in a l
M o r e th a n 5 0 , 0 0 0 B tu h
F o r c e d A ir I n le t
3 '
G
R
AD
E
FIGURE 1
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, regulator
and any relief equipment. These distances apply ONLY
to U.S. Installations.
5.
The vent termination shall 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.
3" or 4" Diameter
SDR-26 Pipe
2 or 2 1/2" Diameter
SDR-26 Pipe
2" or 3" Diameter
Y Concentric Fitting
2" or 3" Diameter
Rain Cap
FIGURE 2
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 DCVK-30 kit can be
used for 3” diameter pipe systems. The DCVK-20 kit can
be used for the 2” diameter pipe system. 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.
1.
Determine the best location for the termination kit. Roof
termination is preferred since it is less susceptible to
damage, has reduced intake contaminants and less vis-
ible vent vapors. For side termination, consideration
should be given to:
a. Possible damage from the vapors to plants/shrubs,
other equipment and building materials
b. Possible damage to the terminal from foreign ob-
jects
c. Wind effects that may cause recirculation of flue
products, debris or light snow
d. Visible vent vapors.
Vent
Maintain 12" (18" for Canada)
minimum clearance above highest
anticipated snow level. Maximum of
24" above roof.
Combustion Air
Roof Boot/Flashing
(Field Supplied)
Support (Field Supplied)
45 Elbow
(Field Supplied)
Combustion Air
Vent
FIGURE 3
