8
7.
Installation
Securing to the wall
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.
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
I=
Service regulator vent outlet
0.9m (3')
J=
Nonmechanical air supply inlet or
combustion air inlet to any other
appliance
K=
Mechanical air supply inlet
L=
Above paved sidewalk or paved
driveway located on public property
Under veranda, porch, deck, or
balcony
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.
*
Air Supply Inlet
Area Where Terminal
is Not Permitted
300mm (12") [300mm (12")]
300mm (12") [900mm (36")]
0.9m (3') above if within
3m (10') [1.8m (6')]
*[300mm (12") - Canada Only****]
300mm (12") [900mm (36")]
[2.1m *** (7' ***)]
