Table of Contents
Advertisement
EXTERIOR HORIZONTAL VENT TERMINATION CLEARANCE REQUIREMENTS
*
See Item D in the Text Below.
Exterior Wall
*18"
V
Horizontal
Termination
6"
Ventilated Soffit
Inside Corner
Detail D
B
V
L
V
F
V
A
X
= Air Supply Inlet
Minimum Clearances
A = Clearance above grade, veranda, porch, deck
or balcony.
B = Clearance to window or door that may be
opened.
C = Clearance to permanently closed window
D = Vertical clearance to ventilated soffit located
above the terminal within a horizontal distance of 18
in. (458 mm) from the center line of the terminal
E = Clearance to unventilated soffit
F = Clearance to outside corner
G = Clearance to inside corner
H = Clearance to each inside of center line extended
above meter / regulator assembly
I = Clearance to service regulator vent outlet
J = Clearance to non-mechanical air supply inlet
to building or the combustion air inlet to any other
appliance
K = Clearance to mechanical air supply inlet
L = Clearance above paved sidewalk or paved
driveway located on public property
M = Clearance under veranda, porch, deck or
balcony
N = Depth of Alcove (Maximum
O = Clearance to Termination (Alcove)
P = Width of Alcove (Minimum)
Q = Clearance to Combustible Above (Alcove)
* In accordance with the current CSA-B149.1 National Gas and B149.2 Propane Installation Code - Latest Editions.
** In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Codes - Latest Edition.
‡ 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.
Figure 6
Inside
Corner Detail
G
V
A
B
C
V
Fixed
V
Operable
Closed
Window
Window
C
B
C
B
C
= Vent Termination
V
Canadian Installation *
12 inches (30 cm) *
6 in. (15.2 cm) for appliances < 10,000 BTU/hr (3kW),
12 in. (30 cm) for appliances > 10,000 BTU/hr (3kW) and <
100,000 BTU/hr (30kW), 36 inches (91 cm) for appliances
> 100,000 BTU/hr (30kW)*
12 inches (305 mm) recommended to prevent window
condensation
18 inches (458 mm)
12 inches (30 cm)
5 inches (12.7 cm)
2 inches (5.08cm) minimum - SV4.5HT-2 •
3 feet (91 cm) within a height of 15 feet above the meter /
regulator assembly *
3 feet (91 cm) *
6 in. (15.2 cm) for appliances < 10,000 BTU/hr (3kW), 12
in. (30 cm) for appliances > 10,000 BTU/hr (3kW) and <
100,000 BTU/hr (30kW), 36 inches (91 cm) for appliances
> 100,000 BTU/hr (30kW)*
6 feet (1.8 meters) *
7 feet (2.13 m) ‡
12 in. (30 cm) * ‡
6 feet (1.83m) *
6 inches (15.2mm)*
3 feet (91cm)*
18 inches (457mm)*
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
NOTE: Local Codes Or Regulations
May Require Different Clearances.
NOTE: Location Of The Vent Termination
Must Not Interfere With Access To The
Electrical Service.
= 9" in U.S.
�
A
= 12" in Canada
3 ft.
X
�
�
A
A
3 ft.
J
B
= Area where Termination is not Permitted
P
N
V
Q
H
M
V
I
K
US Installation **
12 inches (30 cm) **
6 in. (15.2 cm) for appliances < 10,000 BTU/hr (3kW),
9 in. (23 cm) for appliances > 10,000 BTU/hr (3kW) and <
50,000 BTU/hr (15kW), 12 inches (30 cm) for appliances
> 50,000 BTU/hr (15kW)*
9 inches (229 mm) recommended to prevent window
condensation
18 inches (458 mm)
12 inches (30 cm)
5 inches (12.7 cm)
2 inches (5.08cm) minimum - SV4.5HT-2 •
3 feet (91 cm) within a height of 15 feet above the meter
/ regulator assembly **
3 feet (91 cm) **
6 in. (15.2 cm) for appliances < 10,000 BTU/hr (3kW), 9
in. (23 cm) for appliances > 10,000 BTU/hr (3kW) and <
50,000 BTU/hr (15kW), 12 inches (30 cm) for appliances
> 50,000 BTU/hr (15kW)*
3 feet (91 cm) above, if within 10 feet (3 m) horizon-
tally**
7 feet (2.13 m) ‡
12 in. (30 cm) ** ‡
6 feet (1.83m) **
6 inches (15.2mm)**
3 feet (91cm)**
18 inches (457mm)**
N
O
D
E
V
X
7
Advertisement
Table of Contents
