PRODUCT DESIGN
50
VENT/INTAKE T ERMINATIONS F OR I NSTALLATION OF M UL-
TIPLE D IRECT V ENT F URNACES
If more than one direct vent furnace is to be installed verti-
cally through a common roof top, maintain the same mini-
mum clearances between the exhaust vent and air intake
terminations of adjacent units as with the exhaust vent and
air intake terminations of a single unit.
If more than one direct vent furnace is to be installed hori-
zontally through a common side wall, maintain the clear-
ances as in the following figure. Always terminate all ex-
haust vent outlets at the same elevation and always termi-
nate all air intakes at the same elevation.
ents
24" Max.
3" Min.
Screen
24" Max.
90°
Medium
Radius
Elbows
24" Max.
3" Min.
3" Min.
90% Furance Horizontal Venting of Multiple Units
(Dual Pipe)
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.
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
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. Refer to Table 2
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 pipe diameters required for installation
from Table 1. Do not include the field supplied 45° el-
bow in the total elbow count. If more than four elbows
are required, reduce the length of both the inlet and the
exhaust pipes five feet for each additional elbow used.
Elbows are DWV long radius type for 2" and 3" vents.
NOTE: Feet of pipe is whichever pipe run is the longest,
either the inlet or outlet side.
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