5
PRE-INSTALLATION PREPARATION
Continued
D
E
V
B
L
C 
H
N
N 
Fixed |
| V |
Closed |
| |
|
| |
Openable |
| |
F 
V
Openable
B
Fixed
Closed
V
B
I
G
B
B 
V J X | G |
A
M
V 
K 
X
V
G V A
V TERMINATION CAP | X AIR SUPPLY INLET | G | GAS METER |
RESTRICTED AREA 
(TERMINATION PROHIBITED)
A= clearance above grade, veranda, porch, deck, or balcony [*12 inches (30.5cm) minimum]
B= clearance to window or door that may be opened
[12 inches (30.5cm) minimum]
C = clearance to permanently closed window [minimum 12 inches (30.5cm) recommended to prevent condensation on window]
D = vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 24 inches (61cm) from the
E= clearance to unventilated soffit [12 inches (30.5cm) minimum]
F= clearance to outside corner (see below)
G= clearance to inside corner (see below)
H= *not to be installed above a meter/regulator assembly within
36 inches (91.4cm) horizontally from the
I= clearance to service regulator vent outlet [*72 inches (182.9cm) minimum]
J= clearance to
K= clearance to a mechanical air supply inlet [*72 inches (182.9cm) minimum]
L= clearance above paved
M= clearance under veranda, porch, deck [*12 inches (30.5cm) minimum ]
N= clearance above a roof shall extend a minimum of 24 inches (61cm) above the highest point when it passes through the roof surface and any other obstruction within a horizontal distance of 18 inches (45.7cm)
vent shall not terminate directly above a
only permitted if veranda, porch, deck or balconey is fully open on a minimum of 2 sides beneath the floor* * as specified in CAN/SGA B149 (.1 or .2) Installation Codes (1991) for Canada or for U.S.A. installation follow
the current National Fuel Gas Code, ANSI Z223.1
Note: Local codes or regulations may require different clearances
Termination Clearances for Buildings with Combustible and Noncombustible Exteriors
Inside Corner
A |
| A = 6" (15.2cm) |
|
V
Outside Corner
V
B 
B = 6" (15.2cm)
Recessed Location
D 
C | C |
E
V
Balcony with No Side Wall
G |
V |
G = Combustible 24" (61cm) Noncombustible 18" (45.7cm)
Balcony with Perpendicular Side Wall
H
V
J 
Combustible &
Noncombustible
H = 24" (61cm)
J = 20" (50.8cm)
C = Maximum depth of 48" (121.9cm) for recessed location
D = Minimum width for back wall of recessed location - Combustible - 38" (96.5cm) Noncombustible - 24" (61cm)
E = Clearance from corner in recessed location- Combustible - 6" (15.2cm) Noncombustible - 2" (5.1cm)
Figure 5 - Minimum Clearances for Vent Terminations
For
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