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TERMINATION CLEARANCES
Description
US Installations
1
A Clearance above grade, veranda, porch, deck, or balcony
12 inches (305 mm)
B Clearance to window or door that may be open
6 inches (152 mm) for appliance ≤ 10,000 Btuh (3 kW), 9 inches
(229 mm) for appliances > 10,000 Btuh (3 kW) and ≤ 50,000 Btuh
(15 kW), 12 inches (305 mm) for appliances > 50,000 Btuh (15 kW)
C Clearance to permanently closed window
*
D Vertical clearance to ventilated soffit located above the
terminal within a horizontal distance of 2 feet (610 mm)
from the center line of the terminal
*
E Clearance to unventilated soffit
*
F Clearance to outside corner
24"
G Clearance to inside corner
24"
H Clearance to each side of center line extended above me-
ter/regulator assembly
*
I
Clearance to service regulator vent outlet
*
J
Clearance to non-mechanical air supply inlet to building
or the combustion air inlet to any other appliance.
6 inches (152 mm) for appliance ≤ 10,000 Btuh (3 kW), 9 inches
(229 mm) for appliances > 10,000 Btuh (3 kW) and ≤ 50,000 Btuh
(15 kW), 12 inches (305 mm) for appliances > 50,000 Btuh (15 kW)
K Clearance to a mechanical air supply inlet
3 feet (914 mm) above if within 10 feet (3.04 m) horizontally
L Clearance above paved sidewalk or paved driveway lo-
cated on public property
*
M Clearance under veranda, porch, deck, or balcony.
*
The minimum distance from the center of the outside vent to the nearest inside and outside corner or obstruction or overhang is 24"
(457 mm).
1
In accordance with current
ANSI Z223.1/NFPA 54, National Fuel Gas Code
*
For clearances not specified in
ANSI Z223.1/NFPA 54
or
CSA B149.1
, one of the following shall be indicated:
a) A minimum clearance value determined by testing in accordance with section 2.19.6, or;
b) A reference to the following footnote:
“Clearance in accordance with local installation codes and the requirements of the gas supplier.”
