Lennox Hearth VIN operation manual Exterior Horizontal Vent Termination Clearance Requirements

Exterior Horizontal Vent Termination Clearance Requirements

* See Item D in the Text Below.
Exterior Wall		Center Line				Inside
		of Termination
						Corner Detail
	*18”
Horizontal						G
Termination	18”					V
		Ventilated Soffit
					A
Inside Corner
						A	= 9" in U.S.
	DETAIL D						= 12" in Canada
								3 ft.
B				C	B			X
		V					A		A
L			Fixed			Operable
					V
		V	Closed			Window		3 ft.
	F		Window
				C	B		J
	V
			C	C	B	B
		A
X = Air Supply Inlet		V	= Vent Terminal		= Area where Terminal is NOT permitted

H

D E

V

M

V

I

Minimum Clearances	Canadian Installation *	US Installation **
A = Clearance above grade, veranda, porch, deck	12 inches (30 cm) *	12 inches (30 cm) **
or balcony.
B = Clearance to window or door that may be	6 in. (15.2 cm) for appliances < 10,000 BTU/hr (3kW),	6 in. (15.2 cm) for appliances < 10,000 BTU/hr (3kW),
opened.	12 in. (30 cm) for appliances > 10,000 BTU/hr (3kW) and <	9 in. (23 cm) for appliances > 10,000 BTU/hr (3kW) and <
	100,000 BTU/hr (30kW), 36 inches (91 cm) for appliances	50,000 BTU/hr (15kW), 12 inches (30 cm) for appliances
	> 100,000 BTU/hr (30kW)*	> 50,000 BTU/hr (15kW)*
C = Clearance to permanently closed window	12 inches (305 mm) recommended to prevent window	9 inches (229 mm) recommended to prevent window
	condensation	condensation
D = Vertical clearance to ventilated soffit located	18 inches (458 mm)	18 inches (458 mm)
above the terminal within a horizontal distance of 18
in. (458 mm) from the center line of the terminal
E = Clearance to unventilated soffit	12 inches (30 cm)	12 inches (30 cm)
F = Clearance to outside corner	5 inches (12.7 cm)	5 inches (12.7 cm)
G = Clearance to inside corner	6 in. (15 cm)	6 in. (15 cm)
H = Clearance to each inside of center line extended	3 feet (91 cm) within a height of 15 feet above the meter /	3 feet (91 cm) within a height of 15 feet above the meter
above meter / regulator assembly	regulator assembly *	/ regulator assembly **
I = Clearance to service regulator vent outlet	3 feet (91 cm) *	3 feet (91 cm) **
J = Clearance to non-mechanical air supply inlet	6 in. (15.2 cm) for appliances < 10,000 BTU/hr (3kW), 12	6 in. (15.2 cm) for appliances < 10,000 BTU/hr (3kW), 9
to building or the combustion air inlet to any other	in. (30 cm) for appliances > 10,000 BTU/hr (3kW) and <	in. (23 cm) for appliances > 10,000 BTU/hr (3kW) and <
appliance	100,000 BTU/hr (30kW), 36 inches (91 cm) for appliances	50,000 BTU/hr (15kW), 12 inches (30 cm) for appliances
	> 100,000 BTU/hr (30kW)*	> 50,000 BTU/hr (15kW)*
K = Clearance to mechanical air supply inlet	6 feet (1.8 meters) *	3 feet (91 cm) above, if within 10 feet (3 m) horizon-
		tally**
L = Clearance above paved sidewalk or paved	7 feet (2.13 m) ‡	7 feet (2.13 m) ‡
driveway located on public property
M = Clearance under veranda, porch, deck or	12 in. (30 cm) * ‡	12 in. (30 cm) ** ‡
balcony
* In accordance with the current CSA-B149.1 National Gas and B149.2 Propane Installation Code - Latest Editions.
** In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Codes - Latest Edition.
‡ A vent shall not terminate directly above a sidewalk or paved driveway which is located between two single family dwellings and serves both dwellings.
*‡ Only permitted if veranda, porch, deck or balcony is fully open on a minimum 2 sides beneath the floor.

Figure 28	15
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.