Bradford-White Corp EF operation manual Canadian US Installations2 Installations1 Clearance above

Figure 12a. Vent Terminal Clearances (Other than Direct Vent or “Power Vented” Installations)

		Canadian	US			Canadian	US Installations2
		Installations1	Installations2			Installations1
A=	Clearance above	12 inches	12 inches	H=	Clearance to each side	3 feet (91 cm) within a	*b
	grade, veranda, porch,	(30 cm)	(30 cm)		of center line extended	height 15 feet (4.6 m)
	deck or balcony				above meter/regulator	above the
					assembly	meter/regulator
						assembly
B=	Clearance to widow or	36 inches	4 feet (1.2 m)	I=	Clearance to service	36 inches	*b
	door that may be	(91 cm)	below or to the		regulator vent outlet or	(91 cm)
	opened		side of opening;		oil tank vent
			12 inches
			(30 cm) above
			opening
C=	Clearance to	*b	*b	J=	Clearance to non-	36 inches	4 feet (1.2 m)
	permanently closed				mechanical air supply	(91 cm)	below or to side
	window				inlet to building or the		of opening; 12
					combustion air inlet to		inches (30 cm)
					any other appliance		above opening.
D=	Vertical clearance to	*b	*b	K=	Clearance to a	6 feet	3 feet (.9 m)
	ventilated soffit				mechanical air supply	(1.83 m)	above if within
	located above the				inlet		10 feet (3 m)
	terminal within a						horizontally
	horizontal distance of
	2 feet (.6 m) from the
	center line of the
	terminal
E=	Clearance to	*b	*b	L=	Clearance above paved	7 feet	7 feet
	unventilated soffit				sidewalk or paved	(2.13 m) †	(2.13 m) †
					driveway located on
					public property
F=	Clearance to outside	*b	*b	M=	Clearance under a	12 inches (30 cm) ‡	*b
	corner				veranda, porch, deck, or
					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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