11
9
12
Height in Feet
From V
ent Collar
Horizontal Run in Feet
Max. One 90°
Elbow
3
5
5
10
12
Figure 15. Horizontal termination -5/8 pipe.
Figure 16. Horizontal Termination - 4/6 Pipe.
Minimum 1 ft. rise required.
9
12
Height in Feet
From V
ent Collar
Horizontal Run in Feet
Max. One 90°
Elbow
3
5
5
10
12
1
Figure 17. Vent Terminal Clearances - National Fuel Gas Code.
Horizontal Termination Clearance
A
= Clearance above grade, veranda, porch , deck, or
balcony :
*12 inches (30 cm) minimum.
B
= Clearance to window or door that may be opened:
Min. 9 inches, U.S. /
*12 inches (30 cm) CAN.
We recommend 12in. minimum to prevent condensa-
tion on the window.
C
= Clearance to permanently closed window:
Min. 9 inches, U.S. /
*12 inches (30 cm) CAN
We recommend 12in. minimum to prevent condensa-
tion on the window.
D
= Vertical clearance to ventilated soffit located above
the terminal within a horizontal distance of 2 feet (60 cm)
from the centerline of the terminal:
18 inches
(46 cm) minimum.
E
= Clearance to unventilated soffit:
*12 inches (46 cm)
minimum.
F
= Clearance to outside corner:
Min. 9 inches, U.S. /
*12
inches (30 cm) CAN.
We strongly recommend 12 inches,
particularly where windy conditions pevail.
G =
Clearance to inside corner:
Min. 6 inches, U.S. /
*12
inches (30 cm) CAN.
We strongly recommend 12 inches,
particularly where windy conditions pevail.
H =
*Not to be installed above a meter/regulator assembly
within 3 feet (90 cm)
horizontally from the center-line
of the regulator.
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 sidewalk or a paved driveway
located on public property:
*7 feet (2.1 m) min.
M
= Clearance under veranda, porch, deck, or balcony:
*12
inches (30 cm) minimum.
1
* As specified in CGA B149 Installation Codes. Note: Local Codes
and Regulations may require different clearances.
**
A vent shall not terminate directly above a sidewalk or driveway
which is located between two single family dwellings and serves
both dwellings.*
1
Only permitted if veranda, porch, deck, or balcony, is fully open
on a minimum of two sides beneath the floor.*
