15
137750_Rev_L 11.16.12
Figure 19. Vent Terminal Clearances per National Fuel Gas Code.
Figure 20. Termination Clearance to overhangs
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 condensation
on the window.
C = Clearance to permanently closed window:
**Min. 9 inches, U.S. / *12 inches (30 cm) CAN
We recommend 12 in. minimum 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: **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 within 15 feet (4.5 m) above a me
-
ter/regulator assembly within 3 feet (90 cm) horizontally
from the center-line of the regulator.
I = Clearance to service regulator vent outlet:
3 feet (91 cm) 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:
**Min. 3 feet (91 cm) above if within 10 feet horizontally,
U.S. / *6 feet (1.83 m) minimum / CAN
L =
1
Clearance above paved sidewalk or a paved driveway
located on public property:
7 feet (2.1 m) min
.
* In accordance with CSA B149 Installation Codes.
** In accordance with the current ANSI Z223.1/NFPA 54, National
Fuel Gas Code. Note: Local Codes and Regulations may require
different clearances.
*** In accordance with the current NFPA 58 Liquified Petroleum
Gas Code
1
A vent shall not terminate directly above a sidewalk or driveway
which is located between two single family dwellings and serves
both dwellings.
2
Only permitted if veranda, porch, deck, or balcony, is fully open
on a minimum of two sides beneath the floor.*
M = Clearance under veranda, porch, deck, or balcony:
12 inches (30 cm) minimum.
2
N = Clearance to propane tank relief valve and filler connection***:
5 feet (1.52 m) minimum to tanks not filled on site
10 feet (3.05 m) minimum to tanks filled on site from bulk truck
Horizontal Termination Clearance
