22
INSTALLATION CONSIDERATIONS
3” MIN
12” MIN TO GRADE OR HIGHEST
ANTICIPATED SNOW LEVEL
12” MIN SEPARATION
3” - 24”
Termination of Multiple Direct Vent Furnaces
Direct Vent
Terminal
50,000 Btuh
or less
9"
12"
12"
12"
Direct Vent Terminal
More than 50,000 Btuh
Forced Air Inlet
3'
G
R
A
D
E
(DCVK) Vent Termination Clearances
1. The vent termination must be located at least 12” above
ground or normally expected snow accumulation levels.
2. 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.
3. The vent termination shall be located at least 4’ horizon-
tally from any electric meter, gas meter, regulator and
any relief equipment. These distances apply ONLY to
U.S. Installations.
4. 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, ex-
cept another direct vent furnace intake.
5. In Canada, the Canadian Fuel Gas Code takes prece-
dence 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
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 (CVENT-3)
kit can be used for 3” diameter pipe systems. The DCVK-
20 (CVENT-2) kit can be used for the 2” diameter pipe sys-
tem. 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/shurbs,
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
CONDENSATE DRAIN LINES AND DRAIN TRAP
A condensing gas furnace achieves its high level of efficiency
by extracting almost all of the heat from the products of
combustion and cooling them to the point where condensa-
tion takes place. The condensate which is generated must
be piped to an appropriate drain location.
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