44
8.9.2 - Determine location
Locate the vent termination using the
following guidelines:
1. The total length of piping for vent
must not exceed the limits given in
the Section 8.3.
2. You must consider the
surroundings when terminating the
vent:
a. Position the vent termination
where vapors will not damage
nearby shrubs, plants or air
conditioning equipment or be
objectionable.
b. The fl ue 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 fl ue
products impinge on building
surfaces or plants.
d. Avoid possibility of accidental
contact of fl ue 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
fi nishes.
4. The vent piping must terminate
in an elbow pointed outward as
shown in Figure 46 or 49.
WARNING!!! Do not exceed
the maximum lengths of the outside
vent piping shown in Figures 46 or
49. Excessive length exposed to
the outside could cause freezing of
condensate in the vent pipe, resulting
in potential boiler shutdown.
5. Maintain clearances as shown
in Figure 45 (get references to
“Mechanical draft vent terminal”
only). Also maintain the following:
a. Vent must terminate:
• At least 6 feet from adjacent
walls.
• No closer than 12 inches
below roof overhang.
• At least 7 feet above any
public walkway.
• At least 3 feet above any
forced air intake within 10 feet.
• No closer than 4 feet below or
horizontally from any door or
window or any other gravity air
inlet.
b. 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.
Item
unique to CANADA: vent
system shall terminate at
least 6 ft from electrical and
gas meters.
6. 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.
Figure 30 - Vent position of a Direct vent boiler and of a Mechanical draft boiler (not sealed)
8 - INSTALLATION - Vent & combustion air
CAUTION!!! Increase the grade clearances of the snow line quote
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