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Appendix A: Venting Terminations
Location
A
clearance to the termination frame above grade, veranda, porch, deck, or balcony
B
clearance to top of doors or operable windows
C
clearance to sides or bottom of door or operable windows
D
clearance to permanently closed window when installed with approved glass penetration termination
E
clearance to permanently closed window Recommended to prevent condensation
F
clearance to ventilated soffit located within a horizontal distance to 24 inches from centerline of termination
G
clearance to unventilated soffit
H
clearance to outside corner
I
clearance to inside corner
J
clearance to each side of the vertical centerline of a metre or regulatory assembly to a maximum vertical distance of 15ft
K
clearance to service regulator vent outlet
clearance to non mechanical air supply inlet to the building or combustion air inlet to other appliance for appliance <=
L
100.000 BTU/H (30 KW)
M
clearance to forced air supply inlet
N
clearance above paved sidewalk or paved driveway located on public property
P
clearance under veranda, porch, deck, or balcony
Q
clearance above roof
R
clearance to adjacent walls and neighboring buildings
S
clearance from corner in recessed location
T
Maximum depth of recessed location
U
Maximum width for back wall of recessed location
V
Horizontal clearance between two terminations that are level
W
Horizontal clearance (centre to centre) between two terminations that are not level
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 dwelling.
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 code. 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.
XG0230 - 052020
Appendix
Covered
Covered
Alcove Detail
Alcove Detail
Vinyl Siding
2'
2'
2'
2'
17.5''
29.5''
11.5''
17''
Must use Vinyl Siding
Termination Shield
Canada*
12 inches
12 inches
12 inches
0
16 inches
22 inches
30 inches to combustibles
30 inches to combustibles
16 inches to non-combustibles
16 inches to non-combustibles
9 inches
12 inches
3 feet
3 feet
12 inches
6 feet
7 feet
22 inches to combustibles
22 inches to combustibles
16 inches to non-combustibles
16 inches to non-combustibles
2 feet
2 feet
12 inches
4 feet
2 feet
0
18 inches
USA**
12 inches
12 inches
9 inches
0
16 inches
22 inches
9 inches
12 inches
3 feet
3 feet
12 inches
3 feet above air inlet
7 feet
2 feet
18 inches
12 inches
4 feet
2 feet
0
18 inches
37
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