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.
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
US Installations
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.
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.
**Clearance in accordance with local installation codes and the requirements of the gas supplier. **Clearance in accordance with local installation codes and the requirements of the gas supplier.
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