14
Vent Termination Requirements
Figure 15. Vent Terminal Clearances - National Fuel Gas Code
A
= Clearance above grade, veranda, porch , deck, or
balcony :
*12 inches (30 cm) minimum.
B
= Clearance to window or door that may be opened:
9 inches (23 cm) minimum.
We recommend 12
inches to help prevent condensation.
C
= Clearance to permanently closed window:
mimimum 12 inches (30 cm)
recommended to
prevent condensation 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:
9 inches (23 cm) min.
Jøtul N.A. strongly recommends 12 inches (30 cm),
particularlywhere windy conditions are prevalent.
G =
Clearance to inside corner:
6 inches (16 cm) min.
Jøtul
N.A. strongly recommends 12 inches (30 cm),
particularlywhere windy conditions are prevalent.
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.*
