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9
Vent Termination Locations
The air inlet and exhaust outlet must be installed with
the following minimum clearances (see figure 4):
• Twelve inches above grade or maximum
anticipated snow level.
• Twelve inch minimum clearance on top or four foot
clearance below or to the side of door or
window that may be open.
• Four feet horizontally and vertically from gas
or electric meters, gas regulators, dryer vents,
vent hoods, bathroom fan exhaust, attic fans
and turbines.
• Two feet from an inside corner formed by two
exterior walls.
• Two feet from porches, decks, overhangs and
other obstructions.
**Clearance in accordance with local installation codes and the requirements of the gas supplier.
In addition to maintaining the minimum clearances , the
vent should terminate according to the following guidelines:
1. Use only a 3” concentric vent on the vent termination.
Do not expose any 3” X 2” reducers or bushings to
outdoor ambient temperatures.
2. The air inlet and exhaust outlet must not terminate
under a patio, deck or any covered area.
3. Do not terminate the vent near walkways or into
alleys or other publicly accessible areas.
4. Do not terminate the vent in an area where
children or animals could block pipes.
5. Do not locate the vent terminal too close to shrubs or
bushes.
6. Caulk all cracks, seams and joints within 6 feet
horizontally above and below the vent.
Figure 4
Minimum Termination Clearance for
Outlet Vent
A. 12 in (30 cm) min. clearance above grade,
veranda, porch, deck, balcony, or maximum
anticipated snow level.
B. 12 in. (30 cm) min. clearance on top or 4 ft.
clearance below or to the side of door or window
that may be open.
C. Clearance to permanently closed window.**
D. 12 in (30 cm) min. vertical clearance to ventilated
soffit located above the terminal within a horizontal
distance of 2 ft (61 cm) from the center line of the
terminal.
E. 12 in (30 cm) min. clearance to unventilated soffit.
**Clearance in accordance with local installation codes and the requirements of the gas supplier.
US Installations
F. Clearance to outside corner. **
G. 2 ft (61 cm) clearance to inside corner formed by two
exterior walls.
H. 4 ft (122 cm) clearance to each side of center line
extending above meter/regulator assembly.
I. 4 ft (122 cm) clearance to service regulator vent outlet.
J. 12 in (30 cm) clearance on top or 4 ft (122 cm) clear-
ance below or to the side of nonmechanical air supply
inlet to building or the combustion air inlet to any other
appliance.
K. 3 ft (91 cm) above if within 10 ft (3 m) horizontally of
mechanical air supply inlet.