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7.1.2.1 Location of Exhaust Wall Termination
Boiler exhaust
at least 1 ft. above grade
Fig. 16 Minimum clearance for termination
The location of the wall termination is one of the
most important aspects of a direct-vent installation.
In addition to the minimum clearances of termina-
tions shown in Fig. 16, observe the following rules:
1.
Both the intake and exhaust terminations must
be located on the same outside wall in order to
balance wind pressure effects.
2.
Wall terminations shall not be facing the direc-
tion of prevailing winds.
3.
The exhaust terminal must be located such that
flue gases will be freely dispersed without reenter-
ing the building.
4.
Exhaust terminal shall be at least 2 ft. from
adjacent buildings, and flue gases shall not be able
to enter adjacent buildings.
5.
The exhaust terminal shall be at least 7 ft. above
grade when above public walkways. Ensure that
freezing condensate does not lead to hazardous
conditions on walkways.
6.
The exhaust terminal shall never be located under-
neath porches or crawl spaces, alcoves, or other
building features that prevent dispersing flue
gases.
7.
The exhaust terminal shall never be located less
than 3 ft. from inside building corners, and never
Logano G125 BE - Specifications subject to change without notice.
Forced air
inlet
Exhaust terminal
must be at least 3 ft. above
any forced air inlet within 10 ft.
less than 2 ft. from outside corners.
8.
The exhaust terminal shall be located at least 3 ft.
above any forced air inlet within 10 ft. horizontally.
9.
The exhaust terminal shall never be less than 4 ft.
below, 1 ft. above, or 4 ft. horizontally from any
door, window, or gravity air inlet into the building.
10. The exhaust terminal shall be at least 1 ft. above
grade and snow line, and where it is not suscepti-
ble to blockage from debris, leaves or falling snow
or ice.
11. A ½" wire-mesh screen at the exhaust terminal
must be maintained in good working order.
12. The exhaust terminal shall terminate at least 3 ft.
from any other building opening, oil tank vent or oil
tank fill inlet, and 6 ft. from any gas service regula-
tor vent outlet.
13. Select the point of wall penetration maintaining a
minimum slope of ¼" per foot toward the termina-
tion on the last horizontal pipe section. The wall ter-
mination assembly must also slope ¼" per foot
toward the outside to drain possible condensate
from the venting system.
Boiler Installation
1,5'
3'
Boiler exhaust
Gravity air inlet
7
23
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