Installation and Service Manual

8
6-584.13
Section B – Vertical 2-Pipe Vent System
Installation
B1. This section applies to vertically vented 2-pipe (one
combustion air inlet pipe and one 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.
INSTALLATION - VENTING
"H" MIN*
12" MIN
RECOMMENDED
4" MIN
BACK VIEW
ROOF PITCH IS:
X / 12
MINIMUM DISTANCE TO ADJOINING WALL
OR BUILDING IS 2 FEET.
REFER TO TABLE 8.1 FOR "H" DIMENSION.
"H" MIN*
(SEE TABLE 8.1)
TEE WITH DRIP LEG
AND CLEANOUT CAP
(SLOPE 1/4" PER
FOOT DOWNWARD
TOWARD DRIP LEG)
COMBUSTION AIR
ROOF FLASHING
USE LISTED THIMBLE
THROUGH ROOF AND
CEILING
EXHAUST
USE LISTED THIMBLES
THROUGH CEILING
AND ROOF
12
X
ROOF FLASHING
COMBUSTION AIR
EXHAUST
TEE WITH DRIP LEG
AND CLEANOUT CAP
LISTED
TERMINAL
LISTED
TERMINAL
"H" MIN*
(SEE TABLE 8.1)
"H" MIN*
(SEE TABLE 8.1)
Table 8.1 - Minimum Height from Roof to Lowest
Discharge Opening
Rise X (in) Roof Pitch Min Height H (ft) j
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
j Size according to expected snow depth.
Combustion Air
Exhaust
* SIZE ACCORNING
TO EXPECTED
SNOW DEPTH.
TO WALL OR ADJOINING BUILDING
12" MIN
12" MIN*
2' MIN
6" MIN
USE THIMBLE
THROUGH
CELLING
TEE WITH DRIP LEG
AND CLEANOUT CAP
ROOF FLASHING
LISTED
TERMINAL
LISTED
TERMINAL
Figure 8.2 - Vertical 2-Pipe Vent System - Flat Roof
B9. Once venting is complete, proceed section titled “Installation
– Gas Connections”.
Figure 8.1 - Vertical 2-Pipe Vent System - Sloped Roof