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Figure 19. Vent Terminal Clearances - National Fuel Gas Code.
Horizontal Termination Clearance
Figure 20. Termination Clearance to overhangs
3
76 mm
12
305
mm
2 1/2
64 mm
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 12 in. 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 within 15 feet (4.5 m) 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:
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 horizon-
tally, U.S. / *6 feet (1.83 m) minimum / CAN
* In accordance with CSA B149 Installation Codes.
** In accordance with the current ANSI Z223.1/NFFPA 54,
National Fuel Gas Code. Note: Local Codes and Regulations may
require different clearances.
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.*
L =
1
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.
2