Modine Manufacturing IFS Installation And Service Manual page 7

INSTALLATION - VENTING
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 Figures 7.1 or 7.2.
B4. The combustion air and vent pipes must be terminated with
(2) Gary Steel Model 1092 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 7.1 and Table 7.1 or Figure 7.2.
B6. The vent must terminate at least 1 foot above and 16
inches horizontally from the combustion air inlet.
B7. Once venting is complete, proceed section titled "Installation
- Gas Connections".
Figure 7.1 - Vertical Venting - 2 Pipes Sloped Roof
LISTED VENT
TERMINAL
X"
12"
ROOF PITCH = X/12
USE LISTED THIMBLE
THROUGH CEILING
AND ROOF
16" MIN.
LISTED AIR
INLET TERMINAL
"H" MIN. *
SEE TABLE 8.1
FOR "H"
DIMENSION
"H" MIN. *
ROOF
FLASHING
* SIZE TO EXPECTED
SNOW DEPTH.
TEE WITH DRIP LEG
AND CLEANOUT CAP
12" MIN.
RECOMMENDED
Table 7.1 - 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
j Size according to expected snow depth.
Figure 7.2 - Vertical Venting - 2 Pipes Flat Roof
LISTED VENT
TERMINAL
24" MIN.
TO WALL OR
ADJOINING BUILIDING
12" MIN.
12" MIN. *
* SIZE TO EXPECTED
SNOW DEPTH.
Section C - Horizontal 2-Pipe Vent System
Installation
C1. This section applies to horizontally vented 2-pipe vent
systems (one combustion air inlet pipe and one vent pipe)
and is in addition to "Section A - General Instructions - All
Units".
C2. Horizontal vent systems terminate horizontally (sideways).
C3. All horizontal vents must be terminated with a Gary Steel
1092 vent cap. The cap must terminate a minimum
distance from the external wall, as summarized in
Figure 8.1.
C4. The termination of horizontally vented system must extend
12 inches beyond the exterior surface of an exterior wall.
C5. The combustion air pipe must be a minimum of 16 inches
below the vent pipe, and 24 inches from the exterior wall.
C6. Construct the vent system as shown in Figure 8.1.
AIR 5-593.9
Roof Pitch Min Height H (ft) j
Flat to 6/12
6/12 to 7/12
7/12 to 8/12
8/12 to 9/12
9/12 to 10/12
10/12 to 11/12
11/12 to 12/12
12/12 to 14/12
14/12 to 16/12
16/12 to 18/12
18/12 to 20/12
20/12 to 21/12
16" MIN.
LISTED AIR
INLET TERMINAL
ROOF FLASING
USE LISTED THIMBLE
THROUGH ROOF
TEE WITH DRIP LEG
AND CLEANOUT CAP
1.00
1.25
1.50
2.00
2.50
3.25
4.00
5.00
6.00
7.00
7.50
8.00
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