Bradford-White Corp ULTRA HIGH EFFICIENCY GAS WATER HEATER Direct Vent Terminal Clearances

Figure 12b. Direct Vent Terminal Clearances

		Canadian	US			Canadian	US Installations2
		Installations1	Installations2			Installations1
A=	Clearance above grade,	12 inches	12 inches	H=	Clearance to each side	3 feet (.9 m) within a	*b
	veranda, porch, deck or	(30.5 cm)	(30.5 cm)		of center line extended	height 15 feet (4.6 m)
	balcony				above meter/regulator	above the
					assembly	meter/regulator
						assembly
B=	Clearance to widow or	36 inches	12 inches	I=	Clearance to service	36 inches	*b
	door that may be	(91.4 cm)	(30.5 cm)		regulator vent outlet or	(91 cm)
	opened				oil tank vent
C=	Clearance to	*b	*b	J=	Clearance to non-	36 inches	12 inches
	permanently closed				mechanical air supply	(91.4 cm)	(30.5 cm)
	window				inlet to building or the
					combustion air inlet to
					any other appliance
D=	Vertical clearance to	12 inches	12 inches	K=	Clearance to a	6 feet	3 feet (.9 m)
	ventilated soffit located	(30.5 cm)*a	(30.5 cm)*a		mechanical air supply	(1.8 m)	above if within
	above the terminal within				inlet		10 feet (3 m)
	a horizontal distance of 2						horizontally
	feet (.61 m) from the
	center line of the
	terminal
E=	Clearance to	12 inches	12 inches	L=	Clearance above paved	7 feet	*b
	unventilated soffit	(30.5 cm)*a	(30.5 cm)*a		sidewalk or paved	(2.1 m)†
					driveway located on
					public property
F=	Clearance to outside	*b	*b	M=	Clearance under a	12 inches (30.5 cm)‡	12 inches (30.5
	corner				veranda, porch, deck, or		cm)‡
					balcony
G=	Clearance to inside	36 inches	36 inches
	corner	(91.4 cm)*a	(91.4 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 must 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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