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
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= *6 feet (1.8 m) 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
AIR SUPPLY INLET
VENT TERMINAL
GAS METER
AREA WHERE TERMINAL
IS NOT PERMITTED
Figure 47:
TC36 Vent terminal
minimum clearances.
(minimum)
28
TC36_D & TC36_DAR_101215-52
5056.427D
Minimum clearances to the vent terminal must be maintained
as shown in Figure 46. Measure clearances to the nearest
edge of termination hood.
NOTE: Vent terminal must not be recessed
NOTE: LOCAL CODES OR REGULATIONS MAY REQUIRE
DIFFERENT CLEARANCES.
VENT TERMINAL MINIMUM CLEARANCES
TO ADJACENT STRUCTURES
See Roof Pitch Table
Adjacent
Structures
or Fence
48”
(122 cm)
36”
(91.5 cm)
24”
(61 cm)
Figure 46: TC36 Vent roof clearance.
Roof Pitch Table
ft
m
Flat to 6/12 1.00
0.30
Over 6/12 to 7/12
1.25
0.38
Over 7/12 to 8/12
1.50
0.46
Over 8/12 to 9/12
2.00
0.61
Over 9/12 to 10/12
2.50
0.76
Over 10/12 to 11/12
3.25
0.99
Over 11/12 to 12/12
4.00
1.22
Vent Terminal Clearance
Vent Terminal Minimum Clearances