3) Minimum Vent and Air Intake Lengths
- Minimum vent length is 4ft. Minimum air inlet length is 2ft.
4)
Permitted Terminals for Horizontal Venting
(Vent Options 1,2&3)
• Vent Option 1, 2 & 3 -
Exhaust terminal is either Triad PN 240513 (4” vent systems) or PN 240514 (5” vent
systems). The air intake terminal is a 90 degree elbow with a rodent screen supplied by the installer. This elbow is
made out of the same material as the rest of the air inlet system (either galvanized or PVC) and is installed as shown
in Figure 6.2.
• Vent Option 4
- Triad P/N 23569.
5)
Horizontal Vent and Air Intake Terminal Location - Observe the following limitations on the vent terminal location
(also see Figure 6.7):
• Vent terminals must be at least 1 foot from any door, window, or gravity inlet into the building.
• Maintain the correct clearance and orientation between the vent and air intake terminals. The vent and air intake
terminals must be at the same height and their center lines must be between 12 and 36 inches apart. Both terminals
must be located on the same wall.
• The bottom of the vent and air intake terminals must be at least 12” above the normal snow line. In no case should
they be less than 12” above grade level.
• The bottom of the vent terminal must be at least 7 feet above a public walkway.
The Vent Option #1 column in Table 6.1 describes a horizontal direct vent system using 4” vent pipe. From this
column, we see that a T300 may have a vent length of up to 100ft. The first 90 elbow and the termination fitting are
not considered. From Table 6.6, the equivalent length of the 4” 45 elbow is 4.5ft and the equivalent length of the 4”
90 degree elbow is 8ft. The maximum allowable run of straight pipe on this system is therefore:
100ft – 4.5 ft – 8ft = 87.5ft
Since the planned installation has only 28 ft of straight pipe, the planned vent length is acceptable
.
If additional elbows are desired, the maximum allowable vent length must be reduced by the amount shown in
Table 6.6 for each additional elbow used. Termination fittings are not counted when counting additional elbows.
Example:
A 4” twin pipe vent system is planned for a horizontally vented T300 which has the following components:
4 ft vertical pipe
1 90 elbow
10 ft horizontal pipe
1 90 elbow
6 ft horizontal pipe
1 45 elbow
8 ft horizontal pipe
1 termination fitting
8
IMPORTANT
The length of the vent system has a minor impact on the maximum input of the boiler. The exact amount of this
de-rate is dependent upon a number of factors including the type of venting, number of joints in the vent system,
and the type of fuel. An estimate of the amount of de-rate that can be expected at the maximum vent length is as
follows:
T300: Less than 10%
T399, T425: Less than 2%
Содержание Triumph series
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