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Venting Information

Table 12. Vent Termination Clearances

CLEARANCE LOCATION

CANADIAN INSTALLATIONS

US INSTALLATIONS

DIRECT VENT (2-PIPE) &

CONVENTIONAL VENT (1-PIPE)

FURNACES

DIRECT VENT

(2-PIPE) FURNACES

CONVENTIONAL VENT

(1-PIPE) FURNACES

A =

Clearance above grade, veranda, porch, deck,

balcony, or maximum expected snow level.

12 inches (30cm) 12 inches (30cm) 12 inches (30cm)

B =

Clearance to window or door

that may be opened.

6 inches (15cm) for

appliances < 10,000 Btuh (3kW)

6 inches (15cm) for

appliances < 10,000 Btuh (3kW)

4 ft. (1.2m) below or to side

of opening; 1 ft. (300mm)

above opening

12 inches (30cm) for appliances

10,000 Btuh - 100,000 Btuh (30kW)

9 inches (23cm) for appliances

10,000 Btuh - 50,000 Btuh (30kW)

36 inches (91cm) for

appliances > 100,000 Btuh (30Kw)

12 inches (30cm) for

appliances > 50,000 Btuh (30Kw)

C = Clearance to permanently closed window * * *

D =

Vertical clearance to ventilated sofﬁt located

above the terminal within a horizontal distance

of 2 feet (61cm) from the center line of the

terminal.

* * *

E = Clearance to unventilated sofﬁt. * * *

F = Clearance to outside corner. * * *

G = Clearance to inside corner. * * *

H =

Clearance to each side of center line extended

above meter/regulator assembly.

3 feet (91cm) within a height 15 feet

above the meter/regulator assembly

* *

I = Clearance to service regulator vent outlet. 3 feet (1.83m) * *

J =

Clearance to non-mechanical air supply inlet to

building or the combustion air inlet to any other

appliance.

6 inches (15cm) for

appliances < 10,000 Btuh (3kW)

6 inches (15cm) for

appliances < 10,000 Btuh (3kW)

4 ft. (1.2m) below or to side

of opening; 1 ft. (300mm)

above opening

12 inches (30cm) for appliances

10,000 Btuh - 100,000 Btuh (30kW)

9 inches (23cm) for appliances

10,000 Btuh - 50,000 Btuh (30kW)

36 inches (91cm) for

appliances > 100,000 Btuh (30Kw)

12 inches (30cm) for

appliances > 50,000 Btuh (30Kw)

K = Clearance to mechanical air supply inlet. 6 feet (1.83m)

3 feet (91cm) above if within

10 feet (3m) horizontally

3 ft. (91cm) above if within

10 feet (3m) horizontally

L =

Clearance above paved sidewalk or driveway

located on public property.

7 feet (2.13m)

* 7 ft. (2.13m)

M =

Clearance under veranda, porch, deck, or

balcony.

12 inches (30cm)

* *

a: In accordance with the current CSA B149.1 Natural Gas and Propane Installation Guide Code

b: In accordance with the current ANSI Z223.1 / NFPA 54 Natural Fuel Gas Code

c: A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.

d: 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, the following statement shall be included: “Clearance in accordance with local installation

codes, and the requirements of the gas supplier and the manufacturers installation instructions”

VENT TERMINAL

AIR SUPPLY INLET

AREA WHERE TERMINAL IS NO

T PERMITTED