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9
Vent Terminal
Clearance
A=
Above grade, veranda, porch, deck,
or balcony
B=
Window or door that may be opened
C=
Permanently closed window
D=
Vertical clearance to ventilated soffit
located above the terminal within a
horizontal distance of 0.6m
(
2
')
from
the center of the terminal
*
E=
Unventilated soffit
*
F=
Outside corner
*
G=
Inside corner
*
H=
Each side of center line extended
above meter/regulator assembly
0.9m (3') within a height 4.5m (15')
above meter/regulator assembly
0.9m (3') within a height 4.5m (15')
above meter/regulator assembly
I=
Service regulator vent outlet
0.9m (3')
J=
Nonmechanical air supply inlet or
combustion air inlet to any other
appliance
1.2m (4') below or to the side of
opening, or 0.3m (1') above
opening [900mm (36")]
1.2m (4') below or to the side of
opening, or 0.3m (1') above
opening [900mm (36")]
K=
Mechanical air supply inlet
0.9m (3') above if within
3m (10') [1.8m (6')]
0.9m (3') above if within
3m (10') [1.8m (6')]
L=
Above paved sidewalk or paved
driveway located on public property
Under veranda, porch, deck, or
balcony
[2.1m *** (7' ***)]
M=
[ ]= indicates clearances required in Canada
* Maintain clearances in accordance with local installation codes and the requirements of the gas supplier
*** A vent shall not terminate directly above a sidewalk or paved driveway that is located between two
single family dwellings and serves both dwellings.
**** Permitted only if veranda,porch,deck,or balcony is fully open on a minimum of two sides beneath the floor.
*[300mm (12") - Canada Only****] *[300mm (12") - Canada Only****]
*
300mm (12") [300mm (12")]300mm (12") [300mm (12")]
300mm (12") [900mm (36")]
300mm (12") [900mm (36")]
*
*
*
*
0.9m (3')
[2.1m *** (7' ***)]
*
Indoor Installation
(See p.10)
Outdoor Installation
(See p.10, 11)
Air Supply Inlet
Area Where Terminal
is Not Permitted
Clearance Requirements from Vent Terminations to Building Openings
* All clearance requirements are in accordance with ANSI Z21.10.3 and the National Fuel Gas Code,
ANSI Z223.1 and in Canada, in accordance with NSCNGPIC.
07.2.6, 1:29 PMPage 9