Vent / Air Intake Terminal Locations

Direct Vent Terminal Location

Plan the vent system layout so that proper clearances are maintained from plumbing and wiring. Before the vent is installed, determine the vent pipe termination location as shown below in the Vent Terminal Location illustration.

Figure 8. Vent / Air Intake Terminal Positions – Minimum Dimensions.

Table 6. Vent Installation Requirements.

 

 

Canadian 1

US

2

 

 

Canadian 1

US Installations2

 

 

Installations

Installations

 

 

 

Installations

 

 

Clearance above

 

 

 

 

 

36 inches (91 cm) within

 

 

 

12 inches

 

 

Clearance to each side of

a height 15 feet (4.6 m)

 

A

grade, veranda,

12 inches (30 cm)

 

H

 

 

center line extended above

above the

*b

porch, deck or

(30 cm)

 

 

 

 

 

meter/regulator assembly

meter/regulator

 

 

balcony

 

 

 

 

 

 

 

 

 

 

 

assembly

 

 

 

 

 

 

 

 

 

 

Clearance to widow

36 inches (91 cm)

12 inches (30 cm)

 

Clearance to service

 

 

B

for appliances >

for appliances >

I

36 inches

 

or door that may be

regulator vent outlet or oil

*b

100,000 Btuh (30

50,000 Btuh (15

(91 cm)

 

opened

 

tank vent

 

 

kW)

kW)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Clearance to non-

 

 

C

Clearance to

 

 

 

J

mechanical air supply inlet

36 inches (91 cm) for

12 inches (30 cm) for

permanently closed

*b

*b

 

to building or the

appliances > 100,000

appliances > 50,000

 

widow

 

 

 

 

combustion air inlet to any

Btuh (30 kW)

Btuh (15 kW).

 

 

 

 

 

 

other appliance

 

 

 

Vertical clearance

 

 

 

 

 

 

 

 

to ventilated soffit

 

 

 

 

 

 

 

 

located above the

 

 

 

 

 

 

3 feet (91 cm) above

D

terminal within a

*b

*b

 

K

Clearance to a mechanical

6 feet

 

if within 10 feet

horizontal distance

 

air supply inlet

(1.83 m)

 

 

 

 

 

horizontally

 

of 2 feet (61 cm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

from the center line

 

 

 

 

 

 

 

 

of the terminal

 

 

 

 

 

 

 

 

 

 

 

 

 

Clearance above paved

 

 

E

Clearance to

*b

*b

 

L

sidewalk or paved

7 feet

*b

unventilated soffit

 

driveway located on public

(2.13 m)†

 

 

 

 

 

 

 

 

 

 

 

 

property

 

 

F

Clearance to

 

 

 

M

Clearance under a

 

 

*b

*b

 

veranda, porch, deck, or

12 inches (30 cm) ‡

*b

outside corner

 

 

 

 

 

 

balcony

 

 

 

 

 

 

 

 

 

 

G

Clearance to inside

36 inches

36 inches

 

 

 

 

 

corner

(91 cm)*a

(91 cm)*a

 

 

 

 

 

 

 

 

 

 

 

1In accordance with the current CAN/CGA-B149 Installation Codes.

2In accordance with the current ANSI Z223.1-(Latest Edition)/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 a veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. *a) A minimum clearance value determined by testing in accordance with section 2.20.

*b) “Clearance in accordance with local installation codes and the requirements of the gas supplier.”

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Bradford-White Corp TG-199I-N(X), TG237I-N(X) Vent / Air Intake Terminal Locations, Direct Vent Terminal Location
Page 23 Page 25

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