20
Figure 11a - Vent Terminal Clearances (Other than Direct Vent or Powered Direct Vent Installations)
Canadian Installations
1
US Installations
2
Canadian Installations
1
US
Installations
2
A=
Clearance above
grade, veranda,
porch, deck or
balcony
12 inches
(30 cm)
12 inches
(30 cm)
H=
Clearance to each side
of center line extended
above meter/regulator
assembly
3 feet
(91 cm)
within a height
15 feet
(4.6 m)
above the
meter/regulator assembly
*b
B=
Clearance to
window or door that
may be opened
6 in
(15cm)
for appliances
≤10,000 Btuh
(3kW)
; 12 in
(30 cm)
for appliances
>10,000 Btuh
(3kW)
and
≤100,000 Btuh
(30kW)
; 36
in
(91 cm)
for appliances
>100,000 Btuh
(30 kW)
4 feet
(1.2 m)
below or to the
side of opening;
12 inches
(30 cm)
above opening
I=
Clearance to service
regulator vent outlet or
oil tank vent
36 inches
(91 cm)
*b
C=
Clearance to
permanently closed
window
*b
*b
J=
Clearance to non-
mechanical air supply
inlet to building or the
combustion air inlet to
any other appliance
6 in
(15cm)
for appliances
≤10,000 Btuh
(3kW)
; 12 in
(30
cm)
for appliances >10,000
Btuh
(3kW)
a
nd ≤100,000 Btuh
(30kW)
; 36 in
(91 cm)
for
appliances >100,000 Btuh
(30
kW)
4 feet
(1.2 m)
below or to side
of opening;
12 inches
(30
cm)
above
opening.
D=
Vertical clearance
to ventilated soffit
located above the
terminal within a
horizontal distance
of 2 feet (61 cm)
from the center line
of the terminal
*b
*b
K=
Clearance to a
mechanical air supply
inlet
6 feet
(1.83 m)
3 feet
(91 cm)
above if within
10 feet
horizontally
E=
Clearance to
unventilated soffit
*b
*b
L=
Clearance above paved
sidewalk or paved
driveway located on
public property
7 feet
(2.13 m)
†
7 feet
(2.13 m)
†
F=
Clearance to
outside corner
*b
*b
M=
Clearance under a
veranda, porch, deck,
or balcony
12 inches
(30 cm)
‡
*b
G=
Clearance to inside
corner
36 inches
(91 cm)
*a
36 inches
(91 cm)
*a
1
In accordance with the current CAN/CGA-B149
Installation Codes
.
2
In accordance with the current ANSI Z223.1-(Latest Edition)/NFPA 54
National Fuel Gas Code
.
† 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 a veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor.
*a) A minimum clearance value determined by testing in accordance with section 2.20.
*b) “Clearance in accordance with local installation codes and the requirements of the gas supplier”.
NOTICE
If 2 in
(5.1 cm)
pipe is used, then use a 2 in to 3 in reducer to adapt to the 3 in
(7.6 cm)
vent terminal size. If a 2 in
(5.1 cm)
vent terminal is preferred, this terminal is available from your supplier.
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