21091-0-0606
Page 7
TERMINATION CLEARANCES
Description
US Installations
1
A
Clearance above grade, veranda, porch, deck, or balcony
12 inches (30 cm)
B
Clearance to window or door that may be open
6 inches (15 cm) for appliance ≤ 10,000 Btuh (3 kW), 9 inches (23 cm)
for appliances > 10,000 Btuh (3 kW) and ≤ 50,000 Btuh (15 kW), 12
inches (30 cm) 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 (61 cm) from the center line
of the terminal
*
E
Clearance to unventilated soffit
*
F
Clearance to outside corner
*
G
Clearance to inside corner
*
H
Clearance to each side of center line extended above meter/regu-
lator assembly
*
I
Clearance to service regulator vent outlet
*
J
Clearance to nonmechanical air supply inlet to building or the
combustion air inlet to any other appliance.
6 inches (15 cm) for appliance ≤ 10,000 Btuh (3 kW), 9 inches (23 cm)
for appliances > 10,000 Btuh (3 kW) and ≤ 50,000 Btuh (15 kW), 12
inches (30 cm) for appliances > 50,000 Btuh (15 kW)
K
Clearance to a mechanical air supply inlet
3 feet (91 cm) above if within 10 feet (3 m) horizontally
L
Clearance above paved sidewalk or paved driveway located 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 18".
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.”
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