Installation and Operation Manual
TFTN 085-199
28
Table 5-1 Vent Termination Clearances
(…
Continued)
Canadian installations
1
US installation
2
E =
Clearance to unventilated soffit
Not applicable
Not applicable
F =
Clearance to outside corner
Not applicable
Not applicable
G =
Clearance to inside corner
36 in (91 cm)
36 in (91 cm)
H =
Clearance to each side of center line extended above
meter/regulator assembly
3 ft (91 cm) within a height
15 ft (4.6 m)
3 ft (91 cm) within a height
15 ft (4.6 m)
I =
Clearance to service regulator vent outlet
3 ft (91 cm)
3 ft (91 cm)
J =
Clearance to nonmechanical air supply inlet to
building or the combustion air inlet to any other
appliance
36 in (91 cm)
Direct vent = 12 in (30 cm)
Other than direct vent = 4
ft (1.2 m) below or to side
of opening; 1 ft (30 cm)
above opening
K =
Clearance to a mechanical air supply inlet
6 ft (1.83 m)
3 ft (91 cm) above if within
10 ft (3 m) horizontally
L =
Clearance above paved sidewalk or paved driveway
located on public property
Vents cannot be located
above public walkways or
other areas where
condensate or vapor can
cause a nuisance or hazard
Vents cannot be located
above public walkways or
other areas where
condensate or vapor can
cause a nuisance or hazard
M =
Clearance under veranda, porch deck, or balcony
4
12 in (30 cm)
12 in (30 cm)
Notes
:
1)
In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2)
In accordance with the current Z223.1/NFPA 54, National Fuel Gas Code.
3)
If locally adopted installation codes specify clearances different than those illustrated, then the most stringent
clearance shall prevail.
4)
Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
5)
Appliances that terminate through an outside wall of a building and discharge flue gases perpendicular to the
adjacent wall shall be located not less than 10 ft (3.05 m) horizontally from an operable opening in an adjacent
building. This requirement shall not apply to vent terminals that are 2 ft (61 cm) or more above or 25 ft (7.62 m) or
more below operable openings.
