IPT Installation Manual

13
9-511.4
INSTALLATION
A
pproved Cap
Drip Leg
Downward slope 1/4" towards drip leg.
H
See Figure 12.2
x
12"
Roof Pitch
is x/12
Listed thimble
to maintain
clearances as
specified by
listed thimble
manufacturer
Vent Pipe
vent terminal
24" min.
(48" min.
in Canada)
Clean out/drip leg
1/4" Slope up towards termination
Listed thimble
vent terminal
24" min.
(48" min.
in Canada)
Listed Thimble
vent terminal
1/4" Slope down towards termination
Tee with drip leg and cleanout cap at low
point of vent system
* Size according to expected snow depth.
Figure 13.1 - Vertical Venting through Sloped Roof
Table 13.1 - Minimum Height from Roof to Lowest
Discharge Opening
Additional Requirements for Horizontal Venting
1. All horizontal termial must be Modine part number:
- 5H0722850005 (item code 27865) 3" vent pipe
- 5H0722850001 (item code 27866) 4" vent pipe
In the United States, the vent cap must be 24" from wall,
while in Canada, a distance of 48" from the wall is required.
2. When horizontal vents pass through a combustible wall (up to
8 inches thick), use a thimble with 2" clearances to the vent
and insulate between thimble and vent. The vent passage
may also be constructed and insulated as shown in Figure
13.2. Where horizontal vents pass through a non-combustible
wall, no clearances to the wall are required.
Figure 13.2 - Vent Construction through
Combustible Wall
3. The vent system shall terminate at least 3' above any forced
air inlet (except direct vent units) located within 10', and at
least 4' below, 4' horizontally from, or 1' above any door,
window or gravity air inlet into any building. The bottom of the
vent terminal shall be located above the snow line or at least
1' above grade; whichever is greater. When located adjacent
to public walkways the vent system shall terminate not less
than 7' above grade.
4. Vent must extend beyond any combustible overhang of the
building.
5. The vent system shall not terminate over public walkways,
building entrances, or where condensate or vapor could
cause a nuisance or hazard or could be detrimental to the
operation of regulators, relief openings, or other equipment.
6. Precautions must be taken to prevent degradation of building
materials by flue products.
7. When vented horizontally, maintain a 1/4" per foot rise away
from the heater. Place a drain tee and clean out near the vent
connector (see Figure 13.3). Where local authorities have
jurisdiction, a 1/4" downward slope is acceptable. Use a drain
tee with a clean out near the exit of the vent (see Figure 13.4)
or allow the condensate to drip out the end.
Figure 13.3 - Horizontal Venting with Upward Pitch
Figure 13.4 = Horizontal Venting w/Downward Pitch
(with drip leg)
Rise X (inches) Roof Pitch MIn. Height (ft)*
0-6 Flat to 6/12 1
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
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
12-14 12/12 to 14/12 5
14-16 14/12 to 16/12 6
16-18 16/12 to 18/12 7
18-20 18/12 to 20/12 7.50
20-21 20/12 to 21/12 8