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[]
VENT TERMINAL
(_)
AiR SUPPLY
iNLET
[]
AREA WHERE
TERMINAL
iS NOT PERMITTED
Canadian
Installations
I
US Installations
2
A = Clearance
above grade, veranda,
porch,
12 inches (30 cm)
12 inches (30 cm)
deck, or balcony
B=
Clearance
to window or door that may be
6 inches (15 cm) for appliances
10,000
6inches(15cm)
for appliances
10,000
opened
Btuh (3 kW), 12 inches (30 cm) for
Btuh (3 kW), 9 inches (23 cm) for
appliances
> 10,000 Btuh (3 kW) and
appliances
> 10,000 Btuh (3 kW) and
100,00 Btuh (30 kW), 36 inches (91 cm)
50,000 Btuh (15 kW), 12 inches (30 cm)
for appliances
>100,00 Btuh (30 kW)
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
3 feet (91 cm) within a height 15 feet
.
extended
above meter/regulator
assembly
above the meter/regulator
assembly
I =
Clearance
to service regulator
vent outlet
3 feet (1.83 m)
*
J =
Clearance
to nonmechanical
air supply inlet 6 inches (15 cm) for appliances
10,000
6 inches (15 cm) for appliances
10,000
to building
or the combustion
air inlet to any Btuh (3 kW), 12 inches (30 cm) for
Btuh (3 kW), 9 inches (23 cm) for
other appliance
appliances
> 10,000 Btuh (3 kW) and
appliances
> 10,000 Btuh (3 kW) and
100,00 Btuh (30 kW), 36 inches (91 cm)
50,000 Btuh (15 kW), 12 inches (30 cm)
for appliances
>100,00 Btuh (30 kW)
for appliances
> 50,000 Btuh (15 kW)
K = Clearance
to a mechanical
air supply inlet
6 feet (1.83 m)
3 feet (91 cm) above if within 10 feet
(3 m) horizontally
L = Clearance
above paved sidewalk or paved
7 feet (2.13 m) t
.
driveway
located on public property
M = Clearance
under veranda,
porch deck, or
12 inches (30 cm) $
.
balcony
In accordance
with the current
CSA B149.1
Natural
Gas and Propane
Installation
Code
2
In accordance
with the current
ANSI
Z223.1
/ NFPA 54 National
Fuel Gas Code
t
A vent
shall not terminate
directly
above
a sidewalk
or paved
driveway
that is located
between
two single 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.
*
For clearances
not specified
in ANSI
Z223.1
/ NFPA 54 or CSA B149.1,
the following
statement
shall be included:
"Clearance
in accordance
with
local
installation
codes,
and the requirements
of the gas supplier
and the manufacturer's
installation
instructions,"
Figure 19. Vent Termination
Clearances
for Direct Vent Furnaces
23
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