Boiler Installation
7
Logano G125 BE - Specifications subject to change without notice.
23
7.1.2.1 Location of Exhaust Wall 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
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.
Fig. 16
Minimum clearance for termination
3'
1,5'
Boiler exhaust
Boiler exhaust
Gravity air inlet
Exhaust terminal
Forced air
inlet
any forced air inlet within 10 ft.
must be at least 3 ft. above
at least 1 ft. above grade
