Fig. #34
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
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
AIR SUPPLY INLET
VENT TERMINAL
GAS METER
FIXED
CLOSED
FIXED
CLOSED
OPEN-
ABLE
OPEN-
ABLE
AREA WHERE TERMINAL
IS NOT PERMITTED
Vent Terminal Minimum Clearances
36"
See Fig. #33b
48"
ADJACENT
24"
(91.5 cm)
(61 cm)
(122 cm)
STRUCTURES
OR FENCE
VENT TERMINAL MINIMUM CLEARANCES
TO ADJACENT STRUCTURES
Fig. #33
Vent Terminal Clearance
B
B
Minimum clearances to the vent terminal must be maintained as shown
in figure #33 & 34. Measure clearances to the nearest edge of termina-
tion hood.
NOTE: Vent terminal must not be
recessed
NOTE: LOCAL CODES OR REGULATIONS MAY REQUIRE
DIFFERENT CLEARANCES.
Roof Pitch Table
(minimum)
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
Fig. #33b
24
TCWS.38CE3 250313-44
