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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
EXTERIOR HORIZONTAL VENT TERMINATION CLEARANCE REQUIREMENTS
Figure 6
Canadian Installation* US Installation**
A = Clearance above grade, veranda, porch,
deck, or balcony.
12 inches (30cm)* 12 inches (30cm)**
B = Clearance to window or door that may be
opened.
6 in (15cm) for appliances
< 10,000 Btuh (3kW), 12 in (30cm)
for appliances > 10,000 Btuh (3kW) and
< 100,000 Btuh (30kW), 36 inches (91cm)
for appliances > 100,000 Btuh (30kW)*
6 in (15cm) for appliances
< 10,000 Btuh (3kW), 9 in (23cm)
for appliances > 10,000 Btuh (3kW) and
< 50,000 Btuh (15kW), 12 inches (30cm)
for appliances > 50,000 Btuh (15kW)**
C = Clearance to permanently closed window 12" (305mm) recommended to prevent
window condensation
9" (229mm) recommended to prevent
window condensation
D = Vertical clearance to ventilated soffit
located above the terminal within a horizontal
distance of 18 inches (458mm) from the center
line of the terminal
18" (458mm) 18" (458mm)
E = Clearance to unventilated soffit 12" (305mm) 12" (305mm)
F = Clearance to outside corner 5" (12.7cm) minimum 5" (12.7cm) minimum
G = Clearance to inside corner 2" (5.08cm) minimum - SV4.5HT-2 •
6" (15.2cm) minimum - SV4.5HTSS
2" (5.08cm) minimum - SV4.5HT-2 •
6" (15.2cm) minimum - SV4.5HTSS
H = Clearance to each inside of center line
extended above meter/regulator assembly
3 feet (91cm) within a height of 15 feet
above the meter/regulator assembly*
3 feet (91cm) within a height of 15 feet
above the meter/regulator assembly**
I = Clearance to service regulator vent outlet 3 feet (91cm)* 3 feet (91cm)**
J = Clearance to nonmechanical 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 (30cm)
for appliances > 10,000 Btuh (3kW) and
< 100,000 Btuh (30kW), 36 inches (91cm)
for appliances > 100,000 Btuh (30kW)*
6 in (15cm) for appliances
< 10,000 Btuh (3kW), 9 in (23cm)
for appliances > 10,000 Btuh (3kW) and
< 50,000 Btuh (15kW), 12 inches (30cm)
for appliances > 50,000 Btuh (15kW)**
K = Clearance to a mechanical air supply inlet 6 feet (1.83m)* 3 feet (91cm) above if within 10 feet (3m)
horizontally**
L = Clearance above paved sidewalk or paved
diveway located on public property
7 feet (2.13m)‡ 7 feet (2.13m)‡
M = Clearance under veranda, porch, deck or
balcony
12 inches (30cm)*‡ 12 inches (30cm)‡
* In accordance with the current CSA-B149.1 National Gas And Propane Installation Code.
** In accordance with the curent ANSI SZ223.1/NFPA 54 National Fuel Gas Codes.
‡ A vent shall not terminate directly above a sidewalk or paved driveway which is located between two single family dwellings and serves
both dwellings.
*‡ Only permitted if veranda, porch, deck or balcony is fully open on a minimum 2 sides beneath the floor:
• 2" Clearance to Non-Combustibles for SV4.5HT-2 Only.
V
V
V
V
V
F
C
Fixed
Closed
Window
Operable
Window
B
B
A
B
H
M
I
= Area where Termination is not Permitted
= Air Supply Inlet
X
= Vent Termination
V
D
V
3 ft.
3 ft.
A
A
A
= 9” in U.S.
= 12” in Canada
V
L
B
J
X
V
A
G
Inside
Corner Detail
B
C
C
C
*18”
Ventilated Soffit
Horizontal
Termination
Detail D
Exterior Wall
6”
Inside Corner
* See Item D in the Text Below.
V
P
V
O
N
N
Q
NOTE: Local Codes Or Regulations
May Require Different Clearances.
NOTE: Location Of The Vent Termination
Must Not Interfere With Access To The
Electrical Service.
E
K
X
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