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A = Clearance above grade, veranda, 12 in (30 cm) 12 in (30 cm)
porch, deck, or balcony
B = Clearance to window or door that 6 in (15 cm) for appliances 10,000 4 ft (121 cm) below or to side of
may be opened Btuh (3 kW), 12 in (30 cm) for opening; 1 ft (30 cm) above opening
appliances > 10,000 Btuh (3 kW) and
100,000 Btuh (30 kW), 36 in (91 cm)
for appliances > 100,000 Btuh (30 kW)
C = Clearance to permanently closed * *
window
D = Vertical clearance to ventilated soffit * *
located above the terminal within
a horizontal distance of 2 ft(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 3 ft (91 cm) within a height 15 ft *
line extended above ( 458 cm) above the meter / regulator
meter/regulator assembly assembly
I = Clearance to service regulator 3 ft (91 cm) *
vent outlet
J = Clearance to nonmechanical air 6 in (15 cm
) for appliances 10,000 Btuh 4 ft (121 cm) below or to side of
supply inlet to building or the (3 kW),12 in (30 cm) for appliances > opening; 1 ft (30 cm) above
combustion air inlet to any other 10,000 Btuh (3 kW) and 100,000 Btuh opening
appliance (30 kW), 36 in (91 cm) for appliances
> 100,000 Btuh (30 kW)
K = Clearance to a mechanical air supply 6 ft (183 cm) 3 ft (91 cm) above if within 10 ft
inlet (305 cm) horizontally
L = Clearance above paved sidewalk or 7 ft (213 cm) ** 7 ft (213 cm)
paved driveway located on public
property
M = Clearance under veranda, porch 12 in (30 cm) *** *
deck. or balcony
*
**
***
family dwellings and serves both dwellings
Permitted only if veranda, porch ,deck, or balcony is fully open on a minimum of two sides beneath the floor.
"Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer's
installation instructions."
A vent shall not terminate directly above a sidewalk or paveble Cell Footnoted driveway that is located between two single
For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B1 49.1, the following statement shall be included:
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Other Then Direct Vent Terminal Clearances
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