A
X
B
V
V
V
V
X
X
AIR SUPPLY INLET
V
VENT TERMINAL
AREA WHERE TERMINAL IS NOT PERMITED
A
B
B
B
B
B
C
D
E
F
J
I
L
H
M
K
G
25--24--65--2
N
V
O
Other than Direct Vent Termination Clearance
Figure 9
V
V
16
440 01 1024 01
Specifications are subject to change without notice
Item
Clearance Descriptions
Canadian Installation (1)
U.S. Installation (2)
A
Clearance above grade, veranda, porch, deck, balcony, or
anticipated snow level
12
″
(30cm) #
12
″
(30 cm)
B
Clearance to a window or door that may be opened
6
″
(15 cm) for appliances
≤
10,000 BTUH (3kW), 12
″
(30
cm) for appliances > 10,000 Btuh (3 kW) and
≤
100,000 Btuh
(30 kW), 36
″
(91 cm) for appliances > 100,000 Btuh (30 kW)
4
′
(1.2 m) below or to the side of the opening. 1
′
(30 cm)
above the opening.
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
electrical meter or gas service regulator assembly
3
′
(91 cm) within 15
′
(4.5 m) above the meter/regulator
assembly
*
I
Clearance to service regulator vent outlet
3
′
(91 cm)
*
J
Clearance to non--mechanical air supply inlet to building or
the combustion air inlet to any other appliance
6
″
(15 cm) for appliances
≤
10,000 BTUH (3kW), 12
″
(30
cm) for appliances > 10,000 Btuh (3 kW) and
≤
100,000 Btuh
(30 kW), 36
″
(91 cm) for appliances > 100,000 Btuh (30 kW)
4
′
(1.2 m) below or to the side of opening: 1
′
(30 cm) above
opening.
K
Clearance to a mechanical air supply inlet
6
′
(1.83 m)
3
′
(91 cm) above if within 10
′
(3m) horizontally
L
Clearance under a veranda, porch, deck, or balcony
12
″
(30 cm) ‡
*
M
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 from a plumbing vent stack
3
′
(91 cm)
3
′
(91 cm)
O
Clearance above a paved sidewalk or paved driveway located
on public property.
7
′
(2.13 m) +
7
′
(2.13 m)
(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
+ 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, clearances shall be in accordance with local installation codes and the requirements of the gas supplier and the manufacture’s installation
instructions.
Notes:
1. The vent for this appliance shall not terminate
a. Near soffit vents or crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or property damage; or
b. 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 conditions which may cause recirculation of the combustion products of adjacent vents.
Recirculation can cause poor combustion, inlet condensate problems, and accelerated corrosion of the heat exchangers.
