Lennox Hearth 775 manual 7

EXTERIOR HORIZONTAL VENT TERMINATION CLEARANCE REQUIREMENTS

*See Item D in the Text Below.

Exterior Wall

Center Line

Inside

of Termination

Corner Detail

*18”

Horizontal

G

Termination

18”

Ventilated Soffit

V

A

Inside Corner

= 9” in U.S.

A

Detail D

= 12” in Canada

3 ft.

H

B

E

B

X

D

C

A

A

V

L

V

Fixed

V

Operable

Closed

Window

3 ft.

Window

F

V

C

B

J

V

C

C

B

B

M

I

V

A

X = Air Supply Inlet

= Vent Terminal

= Area where Terminal is not Permitted

V

Canadian Installation*

US Installation**

A = Clearance above grade, veranda, porch,

12 inches (30cm)*

12 inches (30cm)**

deck, or balcony.

B = Clearance to window or door that may be

6 in (15cm) for appliances

6 in (15cm) for appliances

opened.

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

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

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

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

< 100,000 Btuh (30kW), 36 inches (91cm)

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

for appliances > 100,000 Btuh (30kW)*

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

C = Clearance to permanently closed window

12" (305mm) recommended to prevent

9" (229mm) recommended to prevent

window condensation

window condensation

D = Vertical clearance to ventilated soffit

18" (458mm)

18" (458mm)

located above the terminal within a horizontal

distance of 18 inches (458mm) from the center

line of the terminal

E = Clearance to unventilated soffit

12" (305mm)

12" (305mm)

F = Clearance to outside corner

5" (12.7cm) minimum

5" (12.7cm) minimum

G = Clearance to inside corner

6" (15.2cm) minimum

6" (15.2cm) minimum

H = Clearance to each inside of center line

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

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

extended above 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

6 in (15cm) for appliances

6 in (15cm) for appliances

to building or the combustion air inlet to any

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

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

other appliance

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

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

< 100,000 Btuh (30kW), 36 inches (91cm)

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

for appliances > 100,000 Btuh (30kW)*

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

K = Clearance to a mechanical air supply inlet

6 feet (1.8m)*

3 feet (91cm) above if within 10 feet (3m)

horizontally**

L = Clearance above paved sidewalk or paved

7 feet (2.13m)‡

7 feet (2.13m)‡

diveway located on public property

M = Clearance under veranda, porch, deck or

12 inches (30cm)*‡

12 inches (30cm)‡

balcony

*In accordance with the current CSA-B149.1 National Gas And B149.2 Propane Installation Code.

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

‡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 5

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

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