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Figure 1 direct vent terminal clearances – Bradford White DH-75T-60FB-3X User Manual

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Figure 1

Direct Vent Terminal Clearances

Canadian Installations1

US Installations2

A=

Clearance above grade, veranda, porch, deck or
balcony

12 inches (30 m)

12 inches (30 cm)

B=

Clearance to widow or door that may be opened

12 inches (30 m)

9 inches (23 cm) for

appliances > 10,000 Btuh

(3 kW) and ≤ 50,000

Btuh (15 kW), 12 inches
(30 cm) for appliances >

50,000 Btuh (15 kW)

C=

Clearance to permanently closed widow

*b

*b

D=

Vertical clearance to ventilated soffit located above the
terminal within a horizontal distance of 2 feet (61 cm)
from the center line of the terminal

12 inches (30 cm) *a

12 inches (30 cm) *a

E=

Clearance to unventilated soffit

12 inches (30 cm) *a

12 inches (30 cm) *a

F=

Clearance to outside corner

*b

*b

G=

Clearance to inside corner

*b

*b

H=

Clearance to each side of center line extended above
meter/regulator assembly

3 feet (91 cm) within a

height 15 feet (4.6 m)

above the

meter/regulator

assembly

*b

I=

Clearance to service regulator vent outlet or oil tank
vent

36 inches (91 cm)

*b

J=

Clearance to non-mechanical air supply inlet to building
or the combustion air inlet to any other appliance

12 inches (30 cm)

9 inches (23 cm) for

appliances > 10,000 Btuh

(3 kW) and ≤ 50,000

Btuh (15 kW), 12 inches
(30 cm) for appliances >

50,000 Btuh (15 kW)

K=

Clearance to a mechanical air supply inlet

6 feet (1.83 m)

3 feet (91 cm) above if

within 10 feet horizontally

L=

Clearance above paved sidewalk or paved driveway
located on public property

7 feet (2.13 m)†

*b

M=

Clearance under a veranda, porch, deck, or balcony

12 inches (30 cm) ‡

*b

1

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

2

In 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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