EXTERIOR HORIZONTAL VENT TERMINATION CLEARANCE REQUIREMENTS

*See Item D in the Text Below.

 

Exterior Wall

Center Line

 

 

of Termination

 

 

 

 

 

 

*18”

 

 

 

 

 

Horizontal

V

 

 

 

 

 

 

 

 

 

Termination

 

 

 

 

 

 

18”

Ventilated Soffit

 

 

 

 

 

 

Inside Corner

 

 

 

 

Detail D

 

 

 

B

 

 

 

C

 

 

 

V

 

L

 

 

Fixed

 

 

 

 

 

 

 

 

 

Closed

 

 

 

F

V

Window

 

 

 

 

 

 

 

 

 

C

 

 

V

 

 

 

 

C

C

 

 

 

 

 

 

 

A

 

 

 

 

 

 

X = Air Supply Inlet

V

 

 

 

NOTE: Local Codes Or Regulations

 

 

 

May Require Different Clearances.

 

Inside

 

NOTE: Location Of The Vent Termination

Corner Detail

 

Must Not Interfere With Access To The

 

Electrical Service.

 

 

 

 

G

 

 

 

V

 

 

A

 

 

 

 

A

= 9” in U.S.

 

= 12” in Canada

 

 

 

H

 

 

 

3 ft.

B

 

 

X

 

 

A

 

 

A

V

Operable

 

 

 

Window

 

3 ft.

 

 

 

B

 

J

 

B

B

 

 

I

= Vent Termination = Area where Termination is not Permitted

N P N

O

V

Q

D

V

M

V

 

Canadian Installation*

US Installation**

 

 

 

A = Clearance above grade, veranda, porch, deck, or balcony.

12 inches (30cm)*

12 inches (30cm)**

B = Clearance to window or door that may be opened.

6 inches (15cm) for appliances

6 inches (15cm) for appliances

 

< 10,000 Btuh (3kW), 12 inches (30cm)

< 10,000 Btuh (3kW), 9 inches (23cm)

 

for appliances > 10,000 Btuh (3kW)

for appliances > 10,000 Btuh (3kW) and

 

 

< 50,000 Btuh (15kW), 12 inches (30cm)

 

 

for appliances > 50,000 Btuh (15kW)**

 

 

 

C = Clearance to permanently closed window

12 inches (305mm) recommended to

9 inches (229mm) recommended to

 

prevent window condensation

prevent window condensation

 

 

 

D = Vertical clearance to ventilated soffit located above the

18 inches (458mm)

18 inches (458mm)

termination within a horizontal distance of 18 inches (458mm)

 

 

from the center line of the termination

 

 

E = Clearance to unventilated soffit***

12 inches (305mm)

12 inches (305mm)

F = Clearance to outside corner

5 inches (12.7cm) minimum

5 inches (12.7cm) minimum

 

 

 

G = Clearance to inside corner

6 inches (15.2cm) minimum

6 inches (15.2cm) minimum

 

 

 

H = Clearance to each inside of center line extended above

3 feet (91cm) within a height of 15 feet

3 feet (91cm) within a height of 15 feet

meter/regulator assembly

above the meter/regulator assembly*

above the meter/regulator assembly**

I = Clearance to service regulator vent outlet

3 feet (91cm)*

3 feet (91cm)**

 

 

 

J = Clearance to nonmechanical air supply inlet to building or

6 inches (15cm) for appliances

6 inches (15cm) for appliances

the combustion air inlet to any other appliance

< 10,000 Btuh (3kW), 12 inches (30cm)

< 10,000 Btuh (3kW), 9 inches (23cm)

 

for appliances > 10,000 Btuh (3kW)

for appliances > 10,000 Btuh (3kW) and

 

 

< 50,000 Btuh (15kW), 12 inches (30cm)

 

 

for appliances > 50,000 Btuh (15kW)**

K = Clearance to a mechanical air supply inlet

6 feet (1.83m)*

3 feet (91cm) above if within 10 feet

 

 

(3m) horizontally**

L = Clearance above paved sidewalk or paved diveway located

7 feet (2.13m)‡

7 feet (2.13m)‡

on public property

 

 

M = Clearance under veranda, porch, deck or balcony

12 inches (30cm)*‡

12 inches (30cm)‡

 

 

 

N = Depth of Alcove (Maximum)

6 feet (1.83m)*

6 feet (1.83m)**

 

 

 

O = Clearance to Termination (Alcove)

6 inches (15.2mm)*

6 inches (15.2mm)**

P = Width of Alcove (Minimum)

3 feet (91cm)*

3 feet (91cm)*

Q = Clearance to Combustible Above (Alcove)

18 inches (457mm)*

18 inches (457mm)**

 

 

 

* In accordance with the current CSA-B149.1 National Gas And Propane Installation Code.

 

** In accordance with the curent ANSI SZ223.1/NFPA 54 National Fuel Gas Codes.

 

*** Clearance required to vinyl soffit material - 30 inches (76cm) minimum.

 

‡ A vent shall not terminate directly above a sidewalk or paved driveway which is located between two single family dwellings and serves both

dwellings.

 

 

*‡ Only permitted if veranda, porch, deck or balcony is fully open on a minimum 2 sides beneath the floor:

 

 

 

 

Figure 8

 

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

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Lennox Hearth MPD-33 Series Canadian Installation US Installation, Inches 30cm, Inches 15cm for appliances, Inches 458mm

MPD-35 Series, MPD-45 Series, MPD-33 Series, MPD-40 Series specifications

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