TOA Electronics SSDV-3328 Exterior HORIZONTAL Vent TERMINATION Clearance Requirements

Exterior HORIZONTAL Vent TERMINATION Clearance Requirements

*See Item D in the Text Below.

Exterior Wall		Center Line
		of Termination
*18
Horizontal	V
Termination

18Ventilated 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			N		P	N
Corner Detail			Must Not Interfere With Access To The						O
			Electrical Service.
	G						Q	V
	V
A
		A	= 9	in U.S.
			= 12 in Canada
						H
				3 ft.
B				X					D
			A		A
V	Operable
	Window			3 ft.
B			J			M
B	B
							V
						I
= Vent Termination		= Area where Termination is not Permitted

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 7

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.