Table of Contents
Advertisement
Page 28
A = Clearance above grade, veranda, porch,
deck, or balcony
B = Clearance to window or door that may be
opened
C
=
C
e l
a
a r
n
e c
o t
p
r e
m
a
n
e
n
y l t
c
o l
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
=
C
e l
a
a r
n
e c
o t
u
n
e v
t n
a l i
e t
d
o s
F
=
C
e l
a
a r
n
e c
o t
o
u
s t
d i
e
o c
n r
r e
G
=
C
e l
a
a r
n
e c
t
i o
s n
d i
e
o c
n r
r e
H = Clearance to each side of centerline
extended above meter / regulator assy
I
=
C
e l
a
a r
n
e c
o t
e s
i v r
e c
e r
g
u
t a l
r o
J = Clearance to nonmechanical air
supply inlet to building or the
combustion air inlet to any
other appliance
K = Clearance to a mechanical air
supply inlet
L = Clearance above paved sidewalk or paved
driveway located on public property
M = Clearance under veranda, porch, deck, or
balcony
† 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.
* The manufacturer shall specify a minimum clearance or state "Not applicable" in the table and/or instructions.
i) The minimum distance from adjacent public walkways, adjacent buildings, openable windows, and building
Notes:
openings shall not be less than those values specified in the National Fule Gas Code, ANSI Z223.1/NFPA 54,
1) In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
and/or the Natural Gas and Propane Installation Code, CSA B149.1;
2) In accordance with the current ANSI Z223.1/NFPA 54, Natural Fuel Gas Code.
ii) Information on preventing blockage by snow; and
3) If locally adopted installation codes specify clearances different than those illustrated, then the most stringent clearance shall prevail.
iii) Information on protecting building materials from degradation by flue gases.
4) For clearances not specified in CAN/CSA-B149, clearance is in accordance with local installation codes and the requirements of the gas supplier.
†
5) For clearances not specified in ANSI Z223.1/ NFPA 54, clearance is in accordance with local installation codes and the requirements of the gas supplier.
A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single
family dwellings and serves both dwellings.
6) IMPORTANT: Terminal must be placed such that it remains a minimum of 12" above maximum expected snow line. Local codes may have more specific
‡
Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
requirements, and must be consulted.
Notes:
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, Natural Fuel Gas Code.
3) If locally adopted installation codes specify clearances different than those illustrated, then
the most stringent clearance shall prevail.
Figure 20. Combustion Air and Vent Through Side Wall
Canadian Installations 1
1
2
n i
3 (
0
c
m
)
● 6 in (15 cm) for appliances ≤ 10,000 Btuh (3 kW)
● 12 in (30 cm) for appliances > 10,000 Btuh (3 kW) and
≤ 100,000 Btuh (30 kW)
● 36 in (91 cm) for appliances >100,000 Btuh (30 kW)
e s
d
w
n i
d
o
w
See Note 4
See Note 4
t i f f
See Note 4
See Note 4
See Note 4
3 ft (91 cm) within a height of 15 ft (4.6 m)
e v
t n
o
t u
t e l
3
t f
9 (
1
c
m
)
6 in (15 cm) for appliances ≤ 10,000 Btuh (3 kW)
●
12 in (30cm) for appliances > 10,000 Btuh (3 kW) and
●
≤ 100,000 Btuh (30 kW)
36 in (91 cm) for appliances > 100,000 Btuh (30 kW)
●
6
t f
1 (
8 .
3
m
)
7
t f
2 (
1 .
3
m
† )
1
2
n i
3 (
0
c
m
‡ )
LAARS Heating Systems
U.S. Installations 2
1
2
n i
3 (
0
c
m
)
● 6 in (15 cm) for appliances ≤ 10,000 Btuh (3 kW)
● 9 in (23 cm) for appliances > 10,000 Btuh (3 kW) and
≤ 50,000 Btuh (15 kW)
● 12 in (30 cm) for appliances >50,000 Btuh (15 kW)
See Note 5
See Note 5
See Note 5
See Note 5
See Note 5
See Note 5
See Note 5
6 in (15 cm) for appliances ≤ 10,000 Btuh (3 kW)
●
9 in (23cm) for appliances > 10,000 Btuh (3 kW) and
●
≤ 50,000 Btuh (15 kW)
12 in (30 cm) for appliances > 50,000 Btuh (15 kW)
●
3
t f
9 (
1
c
m
)
a
b
o
e v
f i
w
h t i
n i
10 ft (3 m) horizontally
7
t f
2 (
1 .
3
m
f )
r o
m
e
h c
a
n
c i
l a
r d
f a
s t
appliances). Vents for Category II and IV appliances
cannot be located above public walkways or other
areas where condensate or vapor can cause a nuisance
or hazard*
See Note 5
*When vent terminal is less than 10 feet (3m)
horizontally from a forced air inlet, the terminal
must be at least 3 feet (0.9m) above the air inlet.
(US only)
s y
e t
m
s
C (
a
e t
g
r o
I y
Advertisement
Table of Contents
Troubleshooting
