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INSTALLATION - VENTING
Section B - Vertical 2-Pipe Vent System Installation
B1. This section applies to vertically vented 2-pipe
(1 combustion air inlet pipe and 1 vent pipe) vent systems
and is in addition to "Section A - General Instructions -
All Units".
B2. Vertical vent systems terminate vertically (up).
B3. It is recommended to install a tee with drip leg and clean
out cap as shown in Figure 8.1.
B4. The combustion air and vent pipes must be terminated with
2 listed vent caps.
B5. Vertical vents must terminate a minimum horizontal and
vertical distance from roof lines and adjacent walls or
obstructions. These minimum distances are outlined in
Figure 8.1 and Table 8.1.
B6. The vent must terminate at least 1' above and 6"
horizontally from the combustion air inlet.
B7. Once venting is complete, proceed to section titled
"Installation - Gas Connections".
Figure 8.1 - Vertical 2-Pipe Vent System
X
ROOF PITCH IS:
X / 12
12
USE LISTED THIMBLE
THROUGH ROOF AND
CEILING
BACK VIEW
EXHAUST
COMBUSTION AIR
RECOMMENDED
TO WALL OR ADJOINING BUILDING
2' MIN
TERMINAL
12" MIN
USE THIMBLE
THROUGH
12" MIN*
CELLING
4" MIN
EXHAUST
COMBUSTION AIR
12" MIN
RECOMMENDED
8
LISTED TERMINAL
"H" MIN*
"H" MIN*
(SEE TABLE 8.1)
ROOF FLASHING
4" MIN
TEE WITH DRIP LEG
AND CLEANOUT CAP
(SLOPE 1/4" PER
FOOT DOWNWARD
TOWARD DRIP LEG)
12" MIN
6" MIN
TERMINAL
ROOF FLASHING
* SIZE ACCORNING
TO EXPECTED
SNOW DEPTH.
TEE WITH DRIP LEG
AND CLEANOUT CAP
(SLOPE 1/4" PER
FOOT DOWNWARD
TOWARD DRIP LEG)
Table 8.1 - Minimum Height from Roof to Lowest Discharge
Opening
Rise X (in)
0-6
6-7
7-8
8-9
9-10
10-11
11-12
12-14
14-16
16-18
18-20
20-21
Size according to expected snow depth.
Section C - Horizontal 2-Pipe Vent System Installation
C1. This section applies to horizontally vented 2-pipe vent
systems (1 combustion air inlet pipe and 1 vent pipe) and is
in addition to "Section A - General Instructions - All Units".
Category III vent systems listed by a nationally recognized
agency and matching the diameters specified may be used.
Different brands of vent pipe materials may not be
intermixed. Under no circumstances should two sections of
double wall vent pipe be joined together within one horizontal
vent system due to the inability to verify complete seal of
inner pipes.
C2. Horizontal vent systems terminate horizontally (sideways).
C3. All horizontal vents must be terminated with a listed vent
cap. The cap must terminate a minimum distance from the
external wall, as summarized in Figure 8.2.
C4. The termination of horizontally vented system must extend
16" beyond the exterior surface of an exterior wall.
C5. The combustion air pipe must be a minimum of 6" below the
vent pipe, and 4" from the exterior wall.
C6. Construct the vent system as shown in Figure 8.2.
Figure 8.2 - Horizontal Venting with Downward Pitch
ADJACENT
BUILDING
2' MIN
12"
6" MIN
LISTED
TERMINAL
4" MIN
SUPPORT BRACKET
6-561.12
Roof Pitch
Min Height H (ft)
Flat to 6/12
1.00
6/12 to 7/12
1.25
7/12 to 8/12
1.50
8/12 to 9/12
2.00
9/12 to 10/12
2.50
10/12 to 11/12
3.25
11/12 to 12/12
4.00
12/12 to 14/12
5.00
14/12 to 16/12
6.00
16/12 to 18/12
7.00
18/12 to 20/12
7.50
20/12 to 21/12
8.00
SLOPE 1/4" PER FOOT
DOWNWARD FROM UNIT
EXHAUST
COMBUSTION AIR
TEE WITH DRIP LEG AND
CLEANOUT CAP AT LOW
POINT OF VENT SYSTEM
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