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Termination clearance for buildings with combustible and noncombustible exteriors.
Vertical Sidewall Installations
Important!
Minimum clearance between vent pipes and combustible
materials is 3 inch on top, and 1 inch (on bottom and sides).
Important!
When vent termination exits through foundation less
than 20 inches below siding outcrop, the vent pipe must extend
outward so that the horizontal vent termination is located flush to,
or beyond the outcrop siding.
Information on Various Venting Routes and Components
Important:
It is always best to locate the fireplace in such a way
that minimizes the number of offsets and horizontal vent length.
Since it is very important that the venting system maintain its balance
between the combustion air intake and the flue gas exhaust, certain
limitations as to vent configurations apply and must be strictly
adhered to.
Figure 6
TERMINATION CLEARANCES
The graph showing the relationship between vertical and horizontal
side wall venting will help to determine the various vent lengths
allowable.
The horizontal vent run refers to the total length of vent pipe from
the flue collar of the fireplace to the face of the outer wall.
Venting termination shall not be recessed into wall or siding.
VENT TERMINATION CLEARANCES
Canadian Installations
US Installations
Canadian Installations
US Installations
A= Clearance above grade,
veranda, porch, deck, or
balcony
12 in (30 cm) minimum
12 in (30cm) minimum
I= Clearance to service
regulator vent outlet
3 ft (91 cm) minimum
6 ft (183 cm) minimum
B= Clearance to window or
door that may be open
12 in (30 cm) minimum
for appliances > 10,000
Btuh (3 kW) and ≤
100,000 Btuh (30 kW),
9 in (23 cm) minimum
for appliances > 10,000
Btuh(3 kW) and ≤
50,000 Btuh (15 kW)
J= Clearance to nonme-
chanical air supply
inlet to building or the
combustion air inlet to
any other appliance
12 in (30 cm) minimum for
appliances > 10,000 Btuh
(3 kW) and ≤ 100,000 Btuh
(30 kW)
9 in (23 cm) minimum
for appliances >
10,000 Btuh (3 kW)
and ≤ 50,000 Btuh
(15 kW)
C= Clearance to perma-
nently closed window
12 in (30 cm) minimum
12 in (30 cm) minimum
K= Clearance to a mechani-
cal air supply inlet
6 ft (1.83 m) minimum
3 ft (91 cm) minimum
above if within 10 ft
horizontally
D= Vertical clearance
ventilated soffit located
above the terminal within
a horizontal distance of 2
feet (61 cm) from the cen-
ter line of the terminal
18 in (45 cm) minimum
18 in (45 cm) minimum
L= Clearance above paved
sidewalk or paved drive-
way located on public
property
7 ft (2.13 m) minimum †
7 ft (2.13 m) minimum
E= Clearance to unventi-
lated soffit
12 in (30 cm) minimum
12 in (30 cm) minimum
M= Clearance under
veranda, porch deck, or
balcony
12 in (30 cm) minimum ‡
12 (30 cm) inches
minimum
F= Clearance to outside
corner
See page 10
See page 10
1
In accordance with the current CSA B149.1, Natural Gas and Propane Instal-
lation Code
G= Clearance inside corner
See page 10
See page 10
2
In Accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas
Code
H= Clearance to each side
of center line extended
above meter/regulator
assembly
3 ft (91 cm) minimum
within a height 15 ft
(4.5 m) above the
meter/regulator
assembly
3 ft (91 cm) minimum
†
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, one of
the following shall be indicated:
a)
A minimum clearance value determined by testing in accordance with section
2.23.5, or;
b)
A reference to the following footnote: “Clearance in accordance with local
installation codes and the requirements of the gas supplier.”
Figure 7
