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AIR SUPPLY
INLET
25-24-65-2
AREA WHERE
TERMINAL
IS NOT PERMITED
Item
Clearance
Descriptions
Canadian
Installation
(1)
U.S. Installation
(2)
A
Clearance
above
grade,
veranda,
porch,
deck,
balcony,
or
12 inches
(30cm)
#
12 inches
(30 cm)
anticipated
snow
level
B
Clearance
to a window
or door
that
may
be opened
6 inches
(15 cm)
for appliances
<_ 10,000
Btuh (3 kW)
4 feet(l.2
m) below
or to the side of the opening.
1 foot(30
cm
12 inches
( 30 cm) for appliances
> 10,000
Btuh
(3 kW0)
above
the opening.
and
-< 100,000
Btuh
(30 kW),
36 inches
(9t
cm)
for
appliances
> 100,000
Btuh (30
kW)
C
Clearance
to a permanently
closed
window
D
Vertical
clearance
to a ventilated
soffit
located
above the
terminal
within
a horizontal
distance
of 2"(61cm)
from the
centerline
of the terminal
E
Clearance
to an unventilated
soffit
F
Clearance
to an outside
corner
G
Clearance
to an inside
corner
H
Clearance
to each
side of the centerline
extended
above
3 feet (91 cm) within
15 feet(4.5
m) above
the meter/regulator
3 feet (91 cm)
_iithin
15 feet
(4.5 m) above
the meter/regulator
electrical
meter
or gas service
regulator
assembly
assembly
assembly
I
Clearance
to service
regulator
vent outlet
3 feet (91 cm)
J
Clearance
to non-mechanical
air supply
inlet to building
or
6 inches
(15
cm) for appliances
-< 10,000
Btuh
(3 kW)
4 feet(t
.2 m) below
or to the side of opening:
1 foot
(30 cm)
the combustion
air inlet
to any other
appliance
12 inches
( 30 cm)
for appliances
> 10,000
Btuh (3 kW0)
above
opening.
and
-< 100,000
Btuh
(30 kW)
36 inches
(91 cm)
for appliances
> t00,000
Btuh
(30 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
under
a veranda,
porch,
deck,
or balcony
12 inches(30
cm)
+
M
7 feet (2.13m)
Clearance
to each
side of the centerline
extended
above
or
below
vent
terminal
of the furnace
to a dryer or water
heater
vent,
or other
appliance's
direct
vent
intake
or exhaust.
N
Clearance
to the vent
terminal
of a dryer
vent,
water
heater
vent,
or other appliances
direct
vent
intake
or exhaust.
O
Clearance
from
a plumbing
vent
stack
p
Clearance
above
paved
sidewalk
or paved
7 feet (2.13m)**
driveway
located
on public
property
(1.)
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
#
18" (46 cm) above
roof surface
+
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.t,
clearances
shall
be in accordance
with local installation
codes
and the requirements
of the gas supplier
and
the
Manufacturer's
installation
instructions.
**
A vent
shall not terminate
above
a sidewalk
or paved
driveway
that
is located
between
two single
family
dwellings
and serves
both
dwellings.
Notes:
1.
The vent for this appliance
shall
not terminate
a.
Over
public
walkways;
or
b.
Near
soffit
vents
or crawl
space
vents
or other
areas where
condensate
or vapor
could
create
a nusiance
or hazard
or property
damage;
or
c.
Where
condensate
vapor could
cause
damage
or could
be detrimental
to the operation
of regulators,
relief
valves,
or other equipment.
2.
When
locating
vent terminations,
consideration
must
be given
to prevailing
winds,
location,
and
other c onditions
which
may cause
recirculation
of the combustiob
products
of adjacent
vents.
Recirculation
can cause
poor combustion,
inlet condensate
problems,
and
accelerated
corrosion
of the heat
exchangers.
3
Avoid
venting
under
a deck
or large
overhang.
Recirculation
could
occur
and
cause
performance
or system
problems.
A08601
Fig. 35 - Ventilated
Combustion
Air Vent Termination
Clearance
32
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