50
Appendix
XG0228 - 021419
Appendix A: Venting Terminations
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’
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A
clearance to the termination frame above grade, veranda, porch, deck, or balcony
12 inches
12 inches
B
clearance to top of doors or operable windows
12 inches
12 inches
C
clearance to sides or bottom of door or operable windows
12 inches
9 inches
D
clearance to permanently closed window when installed with approved glass penetration termination
0
0
E
clearance to permanently closed window Recommended to prevent condensation
16 inches
16 inches
F
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22 inches
22 inches
G
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30 inches to combustibles
16 inches to non-combustibles
30 inches to combustibles
16 inches to non-combustibles
H clearance to outside corner
9 inches
9 inches
I
clearance to inside corner
12 inches
12 inches
J
clearance to each side of the vertical centerline of a metre or regulatory assembly to a maximum vertical distance of 15ft
3 feet
3 feet
K
clearance to service regulator vent outlet
3 feet
3 feet
L
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 inches
12 inches
M clearance to forced air supply inlet
6 feet
3 feet above air inlet
N clearance above paved sidewalk or paved driveway located on public property
7 feet
7 feet
P
clearance under veranda, porch, deck, or balcony
22 inches to combustibles
16 inches to non-combustibles
22 inches to combustibles
16 inches to non-combustibles
Q clearance above roof
2 feet
2 feet
R
clearance to adjacent walls and neighboring buildings
2 feet
18 inches
S
clearance from corner in recessed location
12 inches
12 inches
T
Maximum depth of recessed location
4 feet
4 feet
U Minimum width for back wall of recessed location
2 feet
2 feet
V
Horizontal clearance between two terminations that are level
0
0
W Horizontal clearance (centre to centre) between two terminations that are not level
18 inches
18 inches
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.
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