Initial Installation
QUALIFIED INSTALLERS ONLY
Table 4: Vent termination clearances
Minimum Clearance*
Description
3 ft (0.9 m)
Clearance above the highest point where it passes through a roof surface, refer to
Figure 15.
24 in (0.6 m)
Clearance above
a roof ridge, any other portion of a building, or any other obstruc-
tion within a horizontal distance of 10 feet (3 m), refer to Figure 15.
5 ft (1.5 m)
Clearance for a
vent or chimney above either the highest connected appliance
drafthood outlet, or flue collar.
6 ft (1.83 m)
Clearance to mechanical air supply inlet.
3ft (0.9m)
Clearance to each side of center line extended above meter/regulator assembly.
6 ft (1.83 m)
Radial clearance around service regulator vent outlet.
12 in (30 cm)
Clearance above grade, verandah, porch, deck, or balcony.
3 ft (0.9 m)
Clearance to a building opening or combustion air inlet of another appliance, ex
-
cept with the approval of the authority having jurisdiction for the following reduced
clearances.
9 in (0.23 m)
Exception for inputs up to and including 50,000 Btu/h (15kW)
12 in (0.3 m)
Exception for inputs exceeding 50,000 Btu/h (15kW) but not exceeding 100,000
Btu/h (30kW)
2ft (0.6m)
Minimum
3ft (0.9m)
Minimum
Within
10ft (3m)
Roof ridge or
any other portion
of a building
Figure 15: Roof Clearances.
*Clearances are in accordance with local installation codes and the requiremenets of the gas supplier
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