11
6-534.1
Rise X (in) Roof Pitch Min Height H (ft)
0-6 Flat to 6/12 1.00
6-7 6/12 to 7/12 1.25
7-8 7/12 to 8/12 1.50
8-9 8/12 to 9/12 2.00
9-10 9/12 to 10/12 2.50
10-11 10/12 to 11/12 3.25
11-12 11/12 to 12/12 4.00
12-14 12/12 to 14/12 5.00
14-16 14/12 to 16/12 6.00
16-18 16/12 to 18/12 7.00
18-20 18/12 to 20/12 7.50
20-21 20/12 to 21/12 8.00
INSTALLATION - VENTING
Table 11.1 - Minimum Height from Roof to Lowest
Discharge Opening
Size according to expected snow depth.
12" MIN
RECOMMENDED
4" MIN
TEE WITH DRIP LEG
AND CLEANOUT CAP
(SLOPE 1/4" PER
FOOT DOWNWARD
TOWARD DRIP LEG)
COMBUSTION AIR
EXHAUST
"H" MIN*
12" MIN
RECOMMENDED
4" MIN
BACK VIEW
ROOF PITCH IS:
X / 12
"H" MIN*
(SEE TABLE 8.1)
TEE WITH DRIP LEG
AND CLEANOUT CAP
(SLOPE 1/4" PER
FOOT DOWNWARD
TOWARD DRIP LEG)
ROOF FLASHING
USE LISTED THIMBLE
THROUGH ROOF AND
CEILING
COMBUSTION AIR
EXHAUST
12
X
LISTED TERMINAL
* SIZE ACCORNING
TO EXPECTED
SNOW DEPTH.
TO WALL OR ADJOINING BUILDING
12" MIN
12" MIN*
2' MIN
6" MIN
USE THIMBLE
THROUGH
CELLING
ROOF FLASHING
TERMINAL
TERMINAL
Figure 11.1 - Vertical 2-Pipe Vent System
Section D - Vertical Combustion Air and Vent -
Category III Vent (Separated Combustion) Venting
Instructions
D1. 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”.
D2. Vertical vent systems terminate vertically (up).
D3. It is recommended to install a tee with drip leg and clean out
cap as shown in Figure 11.1.
D4. The combustion air and vent pipes must be terminated with
2 listed vent caps.
D5. 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 11.1 and Table 11.1.
D6. The vent must terminate at least 1' above and 6"
horizontally from the combustion air inlet.
D7. Once venting is complete, proceed to section titled,
"Installation - Gas Connections".
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