Honeywell 238-47969-00A, Gas Water Heater instruction manual Direct Vent Terminal Clearances

Figure 4

Direct Vent Terminal Clearances

		Canadian Installations1	US Installations2
A=	Clearance above grade, veranda, porch, deck or	12 inches (30 m)	12 inches (30 cm)
	balcony
			9 inches (23 cm) for
			appliances > 10,000 Btuh
B=	Clearance to widow or door that may be opened	12 inches (30 m)	(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
	Vertical clearance to ventilated soffit located above the	12 inches (30 cm) *a	12 inches (30 cm) *a
D=	terminal within a horizontal distance of 2 feet (61 cm)
	from the center line of the terminal
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
		3 feet (91 cm) within a
	Clearance to each side of center line extended above	height 15 feet (4.6 m)
H=		above the	*b
	meter/regulator assembly
		meter/regulator
		assembly
I=	Clearance to service regulator vent outlet or oil tank	36 inches (91 cm)	*b
	vent
			9 inches (23 cm) for
			appliances > 10,000 Btuh
J=	Clearance to non-mechanical air supply inlet to building	12 inches (30 cm)	(3 kW) and ≤ 50,000
	or the combustion air inlet to any other appliance		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	7 feet (2.13 m)†	*b
	located on public property
M=	Clearance under a veranda, porch, deck, or balcony	12 inches (30 cm) ‡	*b

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