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25
VENTING
NOTICE:
Venting terminations shall not be recessed into a wall or siding.
Covered
Alcove Detail
17.5’’
11.5’’
2’
2’
Covered
Alcove Detail
Vinyl Siding
Must use Vinyl Siding
Termination Shield
29.5’’
17’’
2’
2’
D
I
J
K
N
P
R
S
S
M
L
U
V
E
H
F
G
D
D
VENT TERMINAL LOCATIONS
CANADA*
U.S.A.**
A = Clearance to the termination frame above grade, veranda, porch, deck, or balcony 12" (30 cm)
12" (30 cm)
B = Clearance to top of doors or operable windows
12" (30 cm)
12" (30 cm)
C = Clearance to sides or bottom of door or operable windows
12" (30 cm)
9" (23 cm)
D = Clearance to permanently closed window, recommended to prevent condensation 16" (41 cm)
16" (41 cm)
E = Clearance to ventilated soffit located within a horizontal distance to 24" (61 cm)
from centerline of termination
22" (56 cm)
22" (56 cm)
F = Clearance to unventilated soffit
30" (76 cm) to combustibles
16" (41 cm) to non-combustible
30" (76 cm) to combustibles
16" (41 cm) to non-combustible
G = Clearance to outside corner
9" (23 cm)
9" (23 cm)
H = Clearance to inside corner
12" (30 cm)
12" (30 cm)
I = Clearance to each side of the vertical centerline of a meter or regulatory assembly
to a maximum vertical distance of 15ft (4.5m)
36" (91 cm)
36" (91 cm)
J = Clearance to service regulator vent outlet
36" (91 cm)
36" (91 cm)
K = Clearance to non-mechanical air supply inlet to the building or combustion air
inlet to other appliance for appliance <=100.000 BTU/H (30 KW)
12" (30 cm)
12" (30 cm)
L = Clearance to forced air supply inlet
72" (183 cm)
36" (91 cm) above air inlet
M = Clearance above paved sidewalk or paved driveway located on public property
84" (213 cm)
84" (213 cm)
N = Clearance under veranda, porch, deck, or balcony
22" to combustibles
16" to non-combustibles
22" to combustibles
16" to non-combustibles
P = Clearance above roof
24" (61 cm)
24" (61 cm)
Q = Clearance to adjacent walls and neighboring buildings
24" (61 cm)
18" (46 cm)
R = Clearance from corner in recessed location
12" (30 cm)
12" (30 cm)
S = Maximum depth of recessed location
48" (122 cm)
48" (122 cm)
T = Maximum width for back wall of recessed location
24" (61 cm)
24" (61 cm)
U = Horizontal clearance between two terminations that are level
0
0
V = Horizontal clearance (center to center) between two terminations that are not level
18" (46 cm)
18" (46 cm)
Note 1: For N a vent shall not terminate directly above the sidewalk or paved driveway which is located between two single-family dwellings and serve both dwellings.
Note 2: For P only permitted if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
Note 3: For J, K, and as specified in CGA B149 installation co de. Local codes or regulations may vary.
* Based on CGA B149.1 Natural Gas and Propane installation code. Local codes may vary, please check with local regulatory agency.
** Based on ANSI Z223.1/NFPA 54 National Fuel Gas Code. Local codes may vary, please check with local regulatory agency.
