16
4.16 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
18. 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 18 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
within15 feet below the terminal
36 90
I Clearance to service regulator vent outlet 36 90
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. 18 Vent terminal locations
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