13
VENT TERMINAL INSTALLATION
Where a vent pipe passes through a combustible wall, a wall thimble
must be used to retain insulation and maintain a 1 inch clearance. The
wall thimble may be cut to length for various wall thicknesses. (see
Fig. # 11) It may be necessary to attach the flex vent pipe to the vent
terminal sleeve before attaching terminal to the wall.
1) Slip the 4 inch inner flex pipe a minimum of 1-1/2 inches over the
inner sleeve of the vent terminal. Secure to the sleeve with
screws provided. Seal the joint and screw heads using the high
temperature sealant.
2) Slip the 8 inch outer flex pipe a minimum of 1-1/2 inches over the
outer sleeve of the vent terminal. Secure to the sleeve with
screws provided. Seal the joint and screw heads using the high
temperature sealant.
3) Install the vent terminal on the outside wall as shown in Fig. # 14.
Attach the terminal to the outside wall at each corner with screws
provided. Do not overtighten screws.
The vent terminal must
not be recessed into the exterior wall or siding.
4) Caulk in place to prevent any moisture entering the building.
NOTE: MINIMUM CLEARANCES TO THE VENT TERMINAL MUST
BE MAINTAINED. (Fig. # 13)
Fig. # 14
Fig. # 13
VENT TERMINAL MINIMUM
CLEARANCES
A=
clearances above grade,
veranda, porch, deck, or
balcony
B=
clearance to window or
door that may be opened
C=
clearance to
permanently closed
window
D=
vertical clearance to
ventilated soffit located
above the terminal within
a horizontal distance of 2
feet (61 cm) from the
center-line of the
terminal
E=
clearance to unventilated
soffit [16-1/4 inches (41
cm) minimum]
F=
clearance to outside
corner
G=
clearance to inside
corner
H=
Clearance to each side
of center line extended
above meter/regulator
assembly
AIR SUPPLY
INLET
VENT TERMINAL
GAS METER
FIXED
CLOSED
FIXED
CLOSED
OPERABLE
OPER-
ABLE
INSIDE
CORNER
DETAIL
AREA WHERE TERMINAL
IS NOT PERMITTED
Canadian Installations
¹
US Installations
²
12 inches (30 cm) minimum
12 inches (30 cm) minimum
9 inches (23 cm) minimum
12 inches (30 cm) minimum
9 inches (23 cm) minimum
16 1/4 inches (41 cm) minimum
16 1/4 inches (41 cm) minimum
16 1/4 inches (41 cm) minimum
16 1/4 inches (41 cm) minimum
8 inches (20 cm) minimum
8 inches (20 cm) minimum
5 3/4 inches (15 cm) minimum
5 3/4 inches (15 cm) minimum
3 feet (91 cm) minimum within a
height 15 feet (4.5m)
above the meter/regulator
assembly
*
12 inches (30 cm) minimum
¹
In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
²
In accordance with the current ANSI Z223.1/NFPA S4, National Fuel Gas Code
†
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
‡
permitted only if veranda, porch, deck, or balcony is fully open on a minimum of 2 sides beneath the
floor
*
C
learance in accordance with local installation codes adn the requirements of the gas supplier.
12 inches (30 cm) minimum
9 inches (23 cm) minimum
6 feet (1.8 m) minimum
3 feet (91 cm) minimum
3 feet (91 cm) minimum above
if within 10 feet (3m)
horizontally
12 inches (30 cm) minimum
‡
7 feet (2.13 m) minimum
†
US Installations
²
Canadian Installations
¹
I=
clearance to service
regulator vent outlet
J=
clearance to
nonmechanical air supply
inlet to building or the
combustion air inlet to any
other appliance
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
M=
clearance under veranda,
porch, deck, or balcony
[16-1/4 inches (41 cm)
minimum]
*
*
*
D
V
V
E
B
L
V
V
V
V
V
X
B
B
B
B
C
F
V
X
V
A
J
B
G
V
I
H
M
X
K
f i r e - p a r t s . c o m
