100001021-50
A=
*12 inches (30 cm) min.
Clearances above grade, veranda, porch, deck, or balcony
B=
*12 inches (30 cm) min.
Clearance to window or door that may be opened
C=
12 inches (30 cm) min.
Clearance to permanently closed window recommended to prevent condensation on window
D=
30 inches (76 cm) min.
Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 2 feet (60 cm)
from the edge of the terminal
E=
30 inches (76 cm) min.
Clearance to unventilated soffit
F=
6 inches (15 cm) min.
Clearance to outside corner
G=
6 inches (15 cm) min.
Clearance to inside corner
H=
3 feet (90 cm) min.
*Not to be installed above a meter/regulator assembly within 3 feet (90 cm) horizontally from the center-line of
the regulator
I=
*3 feet (90 cm) min.
Clearance to service regulator vent outlet
J=
*12 inches (30 cm) min.
Clearance to non mechanical air supply inlet to building or the combustion air inlet to any other appliance
K=
*6 feet (1.8 m) min.
Clearance to a mechanical air supply inlet
L=
*7 feet (2.1 m) min.
^ Clearance above paved side-walk or a paved driveway located on public property
M=
**30 inches (76 cm) min
Clearance under veranda, porch, deck, or balcony
^ a vent shall not terminate directly above a side-walk 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 of 2 sides beneath the floor*
* as specified in CGA B149 Installation Codes, Note: local Codes or Regulation may require different clearances
* for U.S.A. Installations follow the current National Fuel Gas Code, ANSI Z223.1
M
K
I
A
V
G
G
H
A
J
V
G
A
B
C
A
V
V
A
V
B
F
B
L
V
E
V
V
V
D
FIXED
CLOSED
FIXED
CLOSED
OPEN-
ABLE
OPEN-
ABLE
AIR SUPPLY INLET
VENT TERMINAL
GAS METER
AREA WHERE TERMINAL
IS NOT PERMITTED
B
B
Figure 38: Vent terminal minimum clearances.
24
TCWS54D2 091418-40
Vent Terminal Minimum Clearances
