AM Series Boiler & Water Heater User Manual
CHAPTER 6: INSTALL
– VENT & COMBUSTION AIR PIPING
OMM-0100_E
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GF-146
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11/15/2019
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6.5.6 Determining Vent Termination Location
Locate the vent termination using the following guidelines:
1.
The total length of piping for vent must not exceed the limits given in
Section 6.3.
2.
You must consider surrounding factors when terminating the vent, such as:
a) Position the vent termination where vapors will not damage nearby shrubs, plants or air
conditioning equipment or be objectionable.
b) The flue products will form a noticeable plume as they condense in cold air. Avoid areas
where the plume could obstruct window views.
c) Prevailing winds could cause freezing of condensate and water/ice buildup where flue
products impinge on building surfaces or plants.
d) Avoid possibility of accidental contact of flue products with people or animals.
e) Do not locate the terminations where wind eddies could affect performance or cause
recirculation, such as inside building corners, near adjacent buildings or surfaces,
window wells, stairwells, alcoves, courtyards, or other recessed areas.
f) Do not terminate above any door or window. Condensate can freeze, causing ice
formations.
g) Locate or guard vent to prevent condensate damage to exterior finishes.
3.
The vent piping must terminate in an elbow pointed outward as shown in Figures 6-5, 6-6, or
6-7.
CAUTION!
Do not exceed the maximum lengths of the outside vent piping shown in Figure 3-31.
Excessive length exposed to the outside could cause freezing of condensate in the vent pipe,
resulting in potential heater shutdown.
4.
Maintain clearances as shown
in Figure 6-5
. Vent must terminate as follows:
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At least 6 feet from adjacent walls.
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No closer than 12 inches below roof overhang.
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At least 7 feet above any public walkway.
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At least 3 feet above any forced air intake within 10 feet.
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No closer than 4 feet below or horizontally from any door or window or any other gravity
air inlet.
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Do not terminate closer than 4 feet horizontally from any electric meter, gas meter,
regulator, relief valve, or other equipment. Never terminate above or below any of these
within 4 feet horizontally. Requirement unique to CANADA: vent system shall terminate
at least 6 feet from electrical and gas meters.
5.
Locate termination so it is not likely to be damaged by foreign objects, such as stones or
balls, or subject to buildup of leaves or sediment.
