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Clearance Description Canadian Installation (1) U.S. Installation (2)
Clearance above grade, veranda, porch, deck, bah 12 in. (305 ram). 18 in. (457 ram) above roof surface. 12 in. (305 ram)
cony or anticipated snow level
12 in. (305 ram) for appliances > t0,000 Btuh (3kW) 9 in. (229 ram) for appliances > 10,000 Btuh (3kW)
Clearance to a window or door that may be opened and </- 100,000 Btuh (30 kW), 36 in. (914 ram) for and </- 50,000 Btuh (15 kW), 12 in. (305 ram) for
appliances > 100,000 Btuh (30 kW) appliances > 500,000 Btuh (15 kW)
Clearance to a permanently closed window
Vertical clearance to a ventilated soffit located above
the terminal within a horizontal distance of 2 feet (61
cm) from the centerline of the terminal
Clearance to an unventilated soffit
Clearance to an outside corner
Clearance to an inside corner
Clearance to each side of the centerline extended
above electrical meter or gas service regulator as-
sembly
Clearance to service regulator vent outlet
Clearance to non-mechanical air supply inlet to
building or the combustion air inlet to any other applb
ance
Clearance to a mechanical air supply inlet
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 manufacturer's installation
instructions.
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 manufacturer's installation
instructions.
3 ft. (.9 M) within 15 ff. (4.6 M) above the meter/ 3 ft. (.9 M) within 15 ff. (4.6 M) above the meter/
regulator assembly regulator assembly
3 ff. (.9 M)
12 in. (305 ram) for appliances > t0,000 Btuh(3kW)
and </- 100,000 Btuh (30 kW), 36 in. (914 ram) for
appliances > 100,000 Btuh (30 kW)
5 ft. (1.8 M)
J
K
12 in. (305 ram). Permitted onty if veranda, porch,
L Clearance under a veranda, porch, deck, or balcony deck, or balcony is fully open on a minimum of two
sides beneath the floor.
Clearance to each side of the centerline extended
above or below vent terminal of the furnace to a dryer
M or water heater vent, or other appliance's direct vent 12 in. (305 ram) 12 in. (305 ram)
intake or exhaust
Clearance to the vent terminal of a dryer vent, water
N heater vent, or other appliances direct vent intake or 3 ft. (.9 M) 3 ft. (.9 M)
exhaust
O Clearance from a plumbing vent stack 3 ft. (.9 M) 3 ft. (.9 M)
For clearances not specified in ANSI Z223.1/NFPA 54
7 ft. (2.1 M). A vent shall not terminate above a side- or CSA B149.1, clearances shall be in accordance
p Clearance above paved sidewalk or paved driveway walk or paved driveway that is located between two with local installation codes and the requirements of
located on public property single family dwellings and serves both dwellings, the gas supplier and the manufacturer's installation
instructions.
(1) In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
(2) In accordance with the current ANSI Z223.1 .NFI'A 54, National Fuel (;as Code
Notes:
1. The vent Iklr this appliance stiall not terminate:
a. Overpub[icwa[kways: lit
*3 ft. (.9 M) *For clearances not specified in ANSI Z223.1
/NFPA 54or CSA B149.1, clearances shall be in
accordance with local installation codes and the
requirements of the gas supplier and the manufacturer's
installation instructions.
9 in. (229 ram) for appliances > 10,000 Btuh (3kW)
and </- 50,000 Btuh (15 kW), 12 in. (305 ram) for
appliances > 500,000 Btuh (15 kW)
3 ff. (.9 M)
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 manufacturer's installation
instructions.
b. Near so,it vents of crawl space vents or ottier areas wtiere condensa_ or vapor could create a nuisance or hazard or property damage; or
c. Where condensate vapor could cause damage or could be de_imental to the operation of regula_lrs, relief valves, or other equipment.
2. When locating vent terminations, consideration must be given to prevailing winds, location, and other conditions which may cause recirculadon of the combustion products of adjacent vents.
Recirculadon can cause poor combustion, inlet condensate problems, and accelerated co_oshm of the heat exchangers.
3. Avoid venting under a deck or large overhang. Recirculation could occur and cause per_lrmance or system problems.
Al1046
Fig. 45 - Direct Vent Termination Clearance
56
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