21
5.3.
Vent location
•
The vent terminal must be located on an outside wall or through the roof.
•
This direct vent appliance is designed to operate when an undisturbed airflow hits the outside vent terminal from any
direction.
•
The minimum clearances from this terminal that must be maintained when located on an outside wall are shown in figure
34. Any reduction in these clearances could result in a disruption of the airflow or a safety hazard. Local codes or
regulations may require greater clearances.
•
The vent terminal must not be recessed into a wall or siding.
•
The vent terminal should be positioned where it will not be covered by any snowdrifts.
KEY
VENT TERMINAL LOCATIONS - MINIMUM DISTANCES
MINIMUM CLEARANCE
See figure 34
Ins Cms
A
Clearance above grade, verandah, porch, deck or balcony
12
30
B
Clearance to window or door that may be opened
12
30
C
Clearance to permanently closed window (recommended to prevent
condensation on window)
12 30
D
Vertical clearance to ventilated soffit located above the terminal within a
horizontal distance of 2 feet (60 cm) from the center-line of the terminal
18 46
E
Clearance to unventilated soffit
12
30
F
Clearance to outside corner
12
30
G
Clearance to inside corner
12
30
H
Horizontal clearance to center-line of meter/regulator assembly located
below the terminal
36 90
I
Clearance to service regulator vent outlet
72
180
J
Clearance to non-mechanical air supply inlet to the building or the
combustion air inlet to any other appliance
12 30
K
Clearance to a mechanical air supply inlet
72
180
L
Clearance above paved sidewalk or a paved driveway located on public
property.
Note: A vent must not terminate directly above a sidewalk or paved
driveway, which is located between two single family dwellings
and serves both dwellings.
84 210
M
Clearance under a verandah, porch, deck or balcony
Only permitted if veranda, porch, deck or balcony is fully open on a
minimum of 2 sides beneath the floor.
12 30
Note:
Local codes and regulations may require different clearances.
Fig. 34 Vent terminal locations
