Direct Vent Terminal Location

Vent / Air Intake Terminal Locations

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
	Clearance above		12 inches			Clearance to each side of	a height 15 feet (4.6 m)
A	grade, veranda,	12 inches (30 cm)			H	Clearance to each side of	a height 15 feet (4.6 m)
	grade, veranda,					center line extended above	above the	*b
	porch, deck or		(30 cm)			center line extended above	above the	*b
	porch, deck or		(30 cm)			meter/regulator assembly	meter/regulator
	balcony					meter/regulator assembly	meter/regulator
	balcony						assembly
							assembly
	Clearance to widow	36 inches (91 cm)	12 inches (30 cm)			Clearance to service
B	Clearance to widow	for appliances >	for appliances >		I	Clearance to service	36 inches
	or door that may be	for appliances >	for appliances >			regulator vent outlet or oil	36 inches	*b
	or door that may be	100,000 Btuh (30	50,000 Btuh (15			regulator vent outlet or oil	(91 cm)	*b
	opened	100,000 Btuh (30	50,000 Btuh (15			tank vent	(91 cm)
	opened	kW)	kW)			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
C	permanently closed	*b	*b		J	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	3 feet (91 cm) above
	terminal within a					Clearance to a mechanical	6 feet	if within 10 feet
	horizontal distance					air supply inlet	(1.83 m)	if within 10 feet
	horizontal distance					air supply inlet	(1.83 m)	horizontally
	of 2 feet (61 cm)							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
E	unventilated soffit	*b	*b		L	driveway located on public	(2.13 m)†	*b
	unventilated soffit					driveway located on public	(2.13 m)†
						property
F	Clearance to				M	Clearance under a
	Clearance to	*b	*b			veranda, porch, deck, or	12 inches (30 cm) ‡	*b
	outside corner	*b	*b			veranda, porch, deck, or	12 inches (30 cm) ‡	*b
	outside corner					balcony
						balcony
G	Clearance to inside	36 inches	36 inches
G	corner	(91 cm)*a	(91 cm)*a
	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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Vent / Air Intake Terminal Locations