TERMINATION CLEARANCES SIDEWALL DIRECT VENT

 

 

 

 

 

 

DIRECT VENT

 

 

 

 

 

 

 

 

(using outdoor air for combustion)

 

 

 

 

EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION

 

 

 

 

 

 

 

 

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FIXED

 

 

 

 

 

 

 

 

 

 

 

 

 

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FIXED

 

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OPERABL

CLOSED

 

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CLOSED

 

 

 

 

 

 

 

 

 

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OPERABL

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A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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V

VENT TERMINAL

X AIR SUPPLY INLET

 

 

 

AREA WHERE TERMINAL IS NOT PERMITTED

Figure 32.  DIRECT VENT

Vent terminal clearances for “Direct Vent” installations. Direct Vent configurations use outdoor air for combustion.

 

 

CANADIAN INSTALLATIONS 1

US INSTALLATIONS 2

 

 

CANADIAN INSTALLATIONS 1

US INSTALLATIONS 2

 

Clearance above grade,

 

 

 

Clearance to each side

3 feet (91 cm) within a height 15

3 feet (91 cm) within a height

A

 

 

H

of center line extended

veranda, porch, deck or

12 inches (30 cm)

12 inches (30 cm)

above meter/regulator

feet (4.5 m) above the meter/

15 feet (4.5 m) above the

 

balcony

 

 

 

assembly

regulator assembly

meter/regulator assembly*

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6 inches (15 cm)

 

 

 

 

 

 

6 inches (15 cm) for appliances

for appliances up to

 

 

 

 

 

 

10,000 Btu/hr (3 kW),

 

 

 

 

 

 

up to 10,000 Btu/hr (3 kW), 12

 

 

 

 

 

 

9 inches (23 cm) for

 

 

 

 

 

 

inches (30 cm) for appliances

 

 

 

 

B

Clearance to window or

appliances between

I

Clearance to service

 

 

between 10,000 Btu/hr (3 kW)

3 feet (91 cm)

3 feet (91 cm)*

door that may be opened

10,000 Btu/hr (3 kW)

regulator vent outlet

 

 

and 100,000 Btu/hr (30 kW), 36

and 50,000 Btu/hr (15

 

 

 

 

 

 

inches (91 cm) for appliances

 

 

 

 

 

 

kW), 12 inches (30 cm)

 

 

 

 

 

 

above 100,000 Btu/hr (30 kW)

 

 

 

 

 

 

for appliances above

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50,000 Btu/hr (15 kW)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6 inches (15 cm) for appliances up

6 inches (15 cm) for

 

 

 

 

 

 

appliances up to 10,000

 

 

 

 

 

Clearance to a non

to 10,000 Btu/hr (3 kW), 12 inches

 

 

 

 

 

Btu/hr (3 kW), 9 inches (23

 

Clearance to

 

 

 

mechanical air supply

(30 cm) for appliances between

C

 

 

J

cm) for appliances between

permanently closed

6 inches (15 cm)*

6 inches (15 cm)*

inlet into building or

10,000 Btu/hr (3 kW) and 100,000

10,000 Btu/hr (3 kW) and

 

window

 

 

 

combustion air inlet to

Btu/hr (30 kW), 36 inches (91 cm)

50,000 Btu/hr (15 kW), 12

 

 

 

 

 

any other appliance

for appliances above 100,000 Btu/

 

 

 

 

 

inches (30 cm) for appliances

 

 

 

 

 

 

hr (30 kW)

 

 

 

 

 

 

above 50,000 Btu/hr (15 kW)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vertical clearance to

 

 

 

 

 

 

 

ventilated soffit located

 

 

 

Clearance to a

 

 

D

above the terminal within

 

 

K

 

3 feet (91 cm) above if within

12 inches (30 cm)*

12 inches (30 cm)*

mechanical air supply

6 feet (1.83 m)

a horizontal distance of

10 feet (3 m) horizontally

 

2 feet (61 cm) from the

 

 

 

inlet

 

 

 

center line of the terminal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Clearance above

 

 

E

Clearance to unventilated

12 inches (30 cm)*

12 inches (30 cm)*

L

paved sidewalk or

7 feet (2.13 m)†

7 feet (2.13 m)†*

soffit

paved driveway located

 

 

 

 

 

on public property

 

 

 

 

 

 

 

 

 

 

F

cornerClearance to outside

 

 

M

Clearance under

 

 

2 feet (60 cm)*

2 feet (60 cm)*

veranda, porch, deck,

12 inches (30 cm) ‡

12 inches (30 cm) ‡*

 

 

 

 

 

or balcony

 

 

G

cornerClearance to inside

8 feet (2.44 m)*

8 feet (2.44 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.

†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.

* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.

32

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A.O. Smith 3400, 2600, 1700, 2000 instruction manual Termination Clearances Sidewall Direct Vent
Page 31 Page 33

3400, 1700, 2000, 2600 specifications

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