230905-36
TC42_B2 page 17
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
VENT TERMINAL
CLEARANCE
Minimum clearances to the vent terminal
must be maintained as shown in fi gure
#22. Measure clearances to the nearest
edge of termination hood.
NOTE: Vent terminal must not be
recessed into a wall or siding.
N O T E : L O C A L C O D E S O R
R E G U L A T I O N S M A Y R E Q U I R E
DIFFERENT CLEARANCES.
Fig. # 22
VENT TERMINAL MINIMUM
CLEARANCES
A= clearances above grade, veranda, porch, deck, or balcony
[* 12 inches (30 cm) minimum]
B= clearance to window or door that may be opened [* 12
inches (30 cm) minimum]
C= clearance to permanently closed window [minimum 12
inches (30 cm) recommended to prevent condensation on
window]
D= vertical clearance to ventilated soffi t located above the ter-
minal within a horizontal distance of 2 feet (60 cm) from the
center-line of the terminal [30 inches (76 cm) minimum]
E= clearance to unventilated soffi t [30 inches (76 cm) minimum]
F= clearance to outside corner [6 inches (15 cm) minimum]
G= clearance to inside corner [6 inches (15 cm) minimum]
H= * not to be installed above a meter/regulator assembly within
3 feet (90 cm) horizontally from the center-line of the regula-
tor
I= clearance to service regulator vent outlet [* 6 feet (1.8 m)
minimum]
J= clearance to nonmechanical air supply inlet to building or
the combustion air inlet to any other appliance [* 12 inches
(30 cm) minimum]
K= clearance to a mechanical air supply inlet [* 6 feet (1.8 m)
minimum]
L= ^ clearance above paved side-walk or a paved driveway
located on public property [* 7 feet (2.1 m) minimum]
M= clearance under veranda, porch, deck, or balcony [30
inches (76 cm) minimum**]
^ 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 fl oor*
* as specifi ed 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
INSIDE
CORNER
DETAIL
AREA WHERE TERMINAL
IS NOT PERMITTED
36"
24"
4
8
"
ADJACE
N
T
24"
(91.5 cm)
(61 cm)
(61 cm)
(122 cm)
STRUCTURES
OR FE
N
CE
Fig. # 22a
VENT TERMINAL MINIMUM
CLEARANCES TO ADJACENT
STRUCTURES
