A.O. Smith VB/VW- 1000, VB/VW- 750 instruction manual Termination Clearances Sidewall Power Vent

Termination Clearances Sidewall Power Vent

POWER VENT

(using room air for combustion)

EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION

G

V

D

A

H

vE

L

B

v

B

C

B

V

FIXED

E

V

FIXED

V

OPERABL

CLOSED

M

X

CLOSED

V

OPERABL

E

X

V

B

V

F

B

J

K

A

B

V

VENT TERMINAL

X AIR SUPPLY INLET

AREA WHERE TERMINAL IS NOT PERMITTED

Figure 9F.

Vent terminal clearances for “Power Vent” installations. Power Vent configurations use room air for combustion.

		Canadian Installations 1	US Installations 2			Canadian Installations 1	US Installations 2
	Clearance above grade,				Clearance to each side	3 feet (91 cm) within a height 15 feet	3 feet (91 cm) within a
A				H	of center line extended		height 15 feet (4.5 m)
	veranda, porch, deck or	12 inches (30 cm)	12 inches (30 cm)			(4.5 m) above the meter/
					above meter/regulator		above the meter/regulator
	balcony				assembly	regulator assembly	assembly*
		6 inches (15 cm) for appliances up to
	Clearance to window	10,000 Btu/hr (3 kW), 12 inches (30	4 feet (1.2 m) below		Clearance to service
B		cm) for appliances between 10,000	or to side of opening;	I
	or door that may be				regulator vent outlet	3 feet (91 cm)	3 feet (91 cm)*
		Btu/hr (3 kW) and 100,000 Btu/hr (30	1 foot (30 cm) above
	opened	kW), 36 inches (91 cm) for appliances	opening
		above 100,000 Btu/hr (30 kW)
						6 inches (15 cm) for appliances up
	Clearance to				Clearance to a non	to 10,000 Btu/hr (3 kW), 12 inches	4 feet (1.2 m) below or to
					mechanical air supply	(30 cm) for appliances between
C				J			side of opening; 1 foot
	permanently closed	12 inches (30 cm)*	12 inches (30 cm)*		inlet into building or	10,000 Btu/hr (3 kW) and 100,000
							(30 cm) above opening.
	window				combustion air inlet to	Btu/hr (30kW), 36 inches (91cm)
					any other appliance	for appliances above 100,000 Btu/
						hr (30 kW)
	Vertical clearance to
	ventilated soffit located						3 feet (91 cm) above if
	above the terminal				Clearance to a
D				K			within
	within a horizontal	12 inches (30 cm)*	12 inches (30 cm)*		mechanical air supply	6 feet (1.83 m)
							10 feet (3 m) horizontally
	distance of 2 feet (61				inlet
	cm) from the center line
	of the terminal
					Clearance above paved
E	Clearance to	12 inches (30 cm)*	12 inches (30 cm)*	L	sidewalk or paved	7 feet (2.13 m)†	7 feet (2.13 m)
	unventilated soffit				driveway located on
					public property
F	cornerClearance to outside			M	Clearance under
		2 feet (60 cm)*	2 feet (60 cm)*		veranda, porch, deck, or	12 inches (30 cm) ‡	12 inches (30 cm) ‡
					balcony
G	cornerClearance to inside	8 ft. (2.44 m)*	8 ft. (2.44 m)*

1 In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code. 2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.

†A vent should not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.

‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.

* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.

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