A.O. Smith 317443-000, 100 Power Vent DV Series 120 Termination Clearances Sidewall Direct Vent

Termination Clearances Sidewall Direct Vent

DIRECT VENT

(using outdoor 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 14

Vent terminal clearances for “Direct Vent” installations. Direct Vent configurations use outdoor air for combustion.

		US Installations 1			US Installations 1
	Clearance above grade,			Clearance to each side	3 feet (91 cm) within a height
A	veranda, porch, deck or	12 inches (30 cm)	H	of center line extended	15 feet (4.5 m) above the
				above meter/regulator
	balcony			assembly	meter/regulator assembly*
		6 inches (15 cm)
		for appliances up to
		10,000 Btu/hr (3 kW),
		9 inches (23 cm) for
B	Clearance to window or	appliances between	I	Clearance to service	3 feet (91 cm)*
	door that may be opened	10,000 Btu/hr (3 kW)		regulator vent outlet
		and 50,000 Btu/hr (15
		kW), 12 inches (30 cm)
		for appliances above
		50,000 Btu/hr (15 kW)
					6 inches (15 cm) for
				Clearance to a non	appliances up to 10,000
					Btu/hr (3 kW), 9 inches (23
	Clearance to			mechanical air supply
C			J		cm) for appliances between
	permanently closed	6 inches (15 cm)*		inlet into building or
					10,000 Btu/hr (3 kW) and
	window			combustion air inlet to	50,000 Btu/hr (15 kW), 12
				any other appliance
					inches (30 cm) for appliances
					above 50,000 Btu/hr (15 kW)
	Vertical clearance to
	ventilated soffit located			Clearance to a
D	above the terminal within	12 inches (30 cm)*	K		3 feet (91 cm) above if within
				mechanical air supply
	a horizontal distance of				10 feet (3 m) horizontally
	2 feet (61 cm) from the			inlet
	center line of the terminal
				Clearance above
E	Clearance to unventilated	12 inches (30 cm)*	L	paved sidewalk or	7 feet (2.13 m)†*
	soffit			paved driveway located
				on public property
F	cornerClearance to outside		M	Clearance under
		2 feet (60 cm)*		veranda, porch, deck,	12 inches (30 cm) ‡*
				or balcony
G	cornerClearance to inside	18 inches (45 cm)*

1 In accordance with the current ANSI Z223.1/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 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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