Lennox Hearth EN04-VDLPM, MN04-VDLPM, MN03-VDLPM, MP54-VDLPM, MP03-VDLPM Canadian Installation

EXTERIOR HORIZONTAL VENT TERMINATION CLEARANCE REQUIREMENTS

*See Item D in the Text Below.

	Exterior Wall		Center Line
			of Termination
	*18”
	Horizontal	V
	Termination
		18”	Ventilated Soffit
	Inside Corner
		Detail D
	B				C
			V
L				Fixed
				Closed
		F	V	Window
					C
		V
			C	C
		A
			X = Air Supply Inlet		V

		NOTE: Local Codes Or Regulations
		May Require Different Clearances.
Inside		NOTE: Location Of The Vent Termination
Corner Detail		Must Not Interfere With Access To The
		Electrical Service.
G
V
A
A	= 9” in U.S.
	= 12” in Canada
		H
		3 ft.
B		X
	A
		A

VOperable

	Window	3 ft.
B		J
B		B

I

= Vent Termination = Area where Termination is not Permitted

N P N

O

V

Q

D

V

M

V

	Canadian Installation*	US Installation**
A = Clearance above grade, veranda, porch, deck, or balcony.	12 inches (30cm)*	12 inches (30cm)**
B = Clearance to window or door that may be opened.	6 inches (15cm) for appliances	6 inches (15cm) for appliances
	< 10,000 Btuh (3kW), 12 inches (30cm)	< 10,000 Btuh (3kW), 9 inches (23cm)
	for appliances > 10,000 Btuh (3kW)	for appliances > 10,000 Btuh (3kW) and
		< 50,000 Btuh (15kW), 12 inches (30cm)
		for appliances > 50,000 Btuh (15kW)**
C = Clearance to permanently closed window	12 inches (305mm) recommended to	9 inches (229mm) recommended to
	prevent window condensation	prevent window condensation
D = Vertical clearance to ventilated soffit located above the	18 inches (458mm)	18 inches (458mm)
termination within a horizontal distance of 18 inches (458mm)
from the center line of the termination
E = Clearance to unventilated soffit***	12 inches (305mm)	12 inches (305mm)
F = Clearance to outside corner	5 inches (12.7cm) minimum	5 inches (12.7cm) minimum
G = Clearance to inside corner	6 inches (15.2cm) minimum	6 inches (15.2cm) minimum
H = Clearance to each inside of center line extended above	3 feet (91cm) within a height of 15 feet	3 feet (91cm) within a height of 15 feet
meter/regulator assembly	above the meter/regulator assembly*	above the meter/regulator assembly**
I = Clearance to service regulator vent outlet	3 feet (91cm)*	3 feet (91cm)**
J = Clearance to nonmechanical air supply inlet to building or	6 inches (15cm) for appliances	6 inches (15cm) for appliances
the combustion air inlet to any other appliance	< 10,000 Btuh (3kW), 12 inches (30cm)	< 10,000 Btuh (3kW), 9 inches (23cm)
	for appliances > 10,000 Btuh (3kW)	for appliances > 10,000 Btuh (3kW) and
		< 50,000 Btuh (15kW), 12 inches (30cm)
		for appliances > 50,000 Btuh (15kW)**
K = Clearance to a mechanical air supply inlet	6 feet (1.83m)*	3 feet (91cm) above if within 10 feet
		(3m) horizontally**
L = Clearance above paved sidewalk or paved diveway located	7 feet (2.13m)‡	7 feet (2.13m)‡
on public property
M = Clearance under veranda, porch, deck or balcony	12 inches (30cm)*‡	12 inches (30cm)‡
N = Depth of Alcove (Maximum)	6 feet (1.83m)*	6 feet (1.83m)**
O = Clearance to Termination (Alcove)	6 inches (15.2mm)*	6 inches (15.2mm)**
P = Width of Alcove (Minimum)	3 feet (91cm)*	3 feet (91cm)*
Q = Clearance to Combustible Above (Alcove)	18 inches (457mm)*	18 inches (457mm)**
* In accordance with the current CSA-B149.1 National Gas And Propane Installation Code.
** In accordance with the curent ANSI SZ223.1/NFPA 54 National Fuel Gas Codes.
*** Clearance required to vinyl soffit material - 30 inches (76cm) minimum.
‡ 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 8
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.	7